Please Need Help On Exhaust System - Tuner-Junction

GsrVtec · #1 (**permalink**) September 7th, 2006, 05:14 PM

Just as the title states. Im looking into getting a new exhaust system and headers for my 99 Integra Gsr and dont know what to get.

Here is the app:

99Gsr car and Motor (completely stock)
JRSC @ 6PSI

The thing is when I look into gettin an aftermarket test pipe the test pipes only come with one place to bolt the o2 sensor to. But my cat on my gsr has 2 o2 sensors on it. I dont want to run limp mode so whats my best bet (stay with the cat?) Also why dont they make any test pipes with 2 o2 sensor holes?

A_White_Gs-R · #2 (**permalink**) September 7th, 2006, 05:33 PM

How bout a carsound highflow cat 2.5inches, rmf narrow version header, and im gonna go with the apex-i N1 catback system again 2.5inches. That thing exhale soooooo much better and youll be able to take ful advantage of the sc. If you want you can order the o2 bung for the o2 sensor or you can have the installer custom fab it into the cat for you or cut teh bung out of the old cat and put it on the new one. This is good shit but be prepared to drop a pretty penny. ima estimate 1400 for that. rmf = 7-800 approx, cat = 50-70, catback n1 = 600

GsrVtec · #3 (**permalink**) September 7th, 2006, 05:37 PM

I was thinking the apexi WS2 or the NOIR (which one in this case)

Also the Apexi N1 comes in only 60mm which is 2.37in.

Retroshark · #4 (**permalink**) September 7th, 2006, 05:41 PM

apexi exausts are pretty nice sounding, i dont like the N1's so much, but the world sports sound great and should get you some hp here and there.

also, with a test pipe vs cat vs high flow cat, the best would be the magnaflow metal catalyst high flow cat. it typically will gain you 5 hp over stock, where the test pipe only gains 6hp, so for the 1hp, its not worth it to do it illegally etc.

GsrVtec · #5 (**permalink**) September 7th, 2006, 05:45 PM

thats where Im gettin stuck at is the Test pipe/cat area. Cause all the test pipes ive been seeing only have one place for 1 o2 sensor. And the 99 Integra Gsr both o2 sensors are in the car alone. Meaning if I got a test pipe then one o2 sensor would be hanging and not plugged in therefore giving me a CEL. What do I do in this situation? My only solution was to keep the factory cat on there.

A_White_Gs-R · #6 (**permalink**) September 7th, 2006, 05:48 PM

Repeat do not go with a test pipe its not worth it. and if you do get a test pipe just custom fab the o2 sensor in there. Btw if you get the n1 get the piping custom to 2.5". im sure you know an exhaust shop that could do it for you. I had mine done to 2.5. The sound was great especially once i built the motor and dropped the stage 2 cams in. that bitch was screaming loud as hell. You know i was comming when i got off the highway and i lived a few blocks away from the highway. the ws is a lil more quiet than the n1. but power i think is comparable if nto slightly higher on the n1.

GsrVtec · #7 (**permalink**) September 7th, 2006, 05:52 PM

well are 2.37 and 2.5 that much of a difference? Caus eI know a couple of shops just dont really want to go and get it done I just wanna order it and bolt it rite on. As far as the cat would it be ok to stay with my factory one and for the headers possibly DC2 4-1?

Retroshark · #8 (**permalink**) September 7th, 2006, 06:02 PM

it would be ok to stay with it, but if you are boosting... it will be destroyed by the extra fuel you have in there. i say, if you want a test pipe, get one on ebay, as long as its stainless steel, take it to a shop and get another 02 bung welded on it. it will cost probably between 25-50 deppending on where you get it done. i warn you though, you will most likely end up fouling your 02 sensors with a supercharger setup im pretty sure... dont quote me, but im 99% sure they wont even give the correct readings to the ECU...

btw, how are you planning on tuning the car with this supercharger setup? if you were running a chipped ecu and all that, you wouldnt even need o2 sensors, the ecu would be running closed loop anyway and wouldnt read from them.

GsrVtec · #9 (**permalink**) September 7th, 2006, 06:11 PM

as for rite now I was informed by jackson racing and many others that it isnt really required to be tunned at 6psi and stock everything. That I could just bolt on the kit and go. As far as 8psi is where the tunning should begin. But I should be fine with just bolting it on at 6psi.

For the exhaust. Here is what I was thinking. DC2 4-1 JDM ceramic headers, Stock Cat, and Apexi WS2 Exhaust.

Retroshark · #10 (**permalink**) September 7th, 2006, 06:17 PM

you should just get some DC sports header and downpipe. cheapest brand most likely. and also, you shoudl always get tuned! im tuned for 4psi on a broken turbo lol, its raelly unsafe to not tuner your motor.

personally, with your setup id do the following:

JRSC @ 6psi
350-450cc injectors (idk the range in sizes, but arround 350cc's shoudl work)
obd2-obd1 conversion harness
chipped p28 ecu
apexi WS2 exaust
test pipe
DC sports header

and of course, a good tune. you will gain soo much more power if you are tuned right, you really dont want to run the car lean at higher rpm's with that supercharger. id also look into a fuel pressure regulator, one that has some sort of stepping deisgn. idk the proper terminology, but when i was at the tuners, they were using one on a 350z turbo and it basically raised the pressure with the RPM's probably using vaccum, but idk really. just keep it in mind of get one (i think an AEM one is the best) in case, even if you dnt use it right away.

Pooch 1069 · #11 (**permalink**) September 7th, 2006, 06:19 PM

My friend has the WS2 coupled to a carsound highflow cat coupled to the DC stainless 4-1 header. By far the best exhaust money can buy. Out performed my GS-R's custom exhaust by far.

GsrVtec · #12 (**permalink**) September 7th, 2006, 06:24 PM

Quote:

Originally Posted by Retroshark

you should just get some DC sports header and downpipe. cheapest brand most likely. and also, you shoudl always get tuned! im tuned for 4psi on a broken turbo lol, its raelly unsafe to not tuner your motor.

personally, with your setup id do the following:

JRSC @ 6psi
350-450cc injectors (idk the range in sizes, but arround 350cc's shoudl work)
obd2-obd1 conversion harness
chipped p28 ecu
apexi WS2 exaust
test pipe
DC sports header

and of course, a good tune. you will gain soo much more power if you are tuned right, you really dont want to run the car lean at higher rpm's with that supercharger. id also look into a fuel pressure regulator, one that has some sort of stepping deisgn. idk the proper terminology, but when i was at the tuners, they were using one on a 350z turbo and it basically raised the pressure with the RPM's probably using vaccum, but idk really. just keep it in mind of get one (i think an AEM one is the best) in case, even if you dnt use it right away.

sounds like a nice setup. I actually was told by JadKar whom has a JRSC kit on his b18c motor that it was ok to just get the basic system at 6psi and just bolt it on and be fine and not have to worry about it. But tune to get more power. Also to upgrade the injectors means to upgrade the fuel pump as well right?

scottigee · #13 (**permalink**) September 7th, 2006, 06:26 PM

Hey dude, I'm sitting on a Random Technologies high flow cat with a 2nd O2 bung. I had it on my GSR but took it off to pass smog in cali (emissions-wise it passed but it failed visual). I'll let it go for $50...that's about 1/2 price of a new one and 1/18th the price of a new GSR cat if you fuel soak yours and need to replace it

I think the WS is a great exhaust but you'll be choking your car up high, especially with the supercharger. You should get at least 2.5". And yes, the smallest bit of size difference matters because it's all about the cross-sectional area of the pipe which is a function of the square of the radius. So a 2.25" pipe has a cross sectional area of 15.9 square inches while a 2.5" pipe has a cross sectional area of 19.6 square inches....that's a 25% increase! Then multiply that by the lengh of the pipe for volume and you'll see a little more pipe moves a hell of a lot more exhaust gas.
Plus the general reviews on the WS are "sounds nice and quiet but doesn't make as much power"

I have a custom 2.25" setup with a 24" resonator and superturbo exhaust (98 GSR, stock cat, DC 4-2-1. If you're in the area and want to listen/go for a ride let me know. good luck

scottigee · #14 (**permalink**) September 7th, 2006, 06:31 PM

JR says 6lbs is safe out of the box because your stock ECU will pick up on the change in airflow and up the fuel delivery accordingly. In other words you can feed the SC by moving to the upper limits of what your stock injection system can do; but you're still at the lower end of what your SC can do. The right thing to do is like Retro said - go with bigger injectors, an FPR and a piggyback and get it tuned. That's how you unleash the most power out of your investmetn. As for fuel pump you'll have to do the math. Injectors are rated in CCs/Min and Fuel pumps are rated in liters/hour. 1,000 CC's = 1L .... and 60 minutes = 1 hour

GsrVtec · #15 (**permalink**) September 7th, 2006, 06:42 PM

excellent repsone thank you. As for that high flow cat you got? Is that a direct bolt on for a 99gsr? direct in length? Where are you located?

Also how about a skunk2 exhaust system? its 2.5in piping? How would that be?

jadkar · #16 (**permalink**) September 7th, 2006, 06:46 PM

My .02

Kamikaze supercharger header (make sure you get the 2.5 outlet)
Greddy SP2

I love my SP2 exhaust with the exception of my ghetto blaster tip (which I'm cutting off soon). I also run a test pipe but I really don't think I gain much from it plus I don't need to inspect my cars

street_accord94 · #17 (**permalink**) September 7th, 2006, 06:53 PM

Quote:

Originally Posted by Retroshark

you should just get some DC sports header and downpipe. cheapest brand most likely. and also, you shoudl always get tuned! im tuned for 4psi on a broken turbo lol, its raelly unsafe to not tuner your motor.

personally, with your setup id do the following:

JRSC @ 6psi
350-450cc injectors (idk the range in sizes, but arround 350cc's shoudl work)
obd2-obd1 conversion harness
chipped p28 ecu
apexi WS2 exaust
test pipe
DC sports header

and of course, a good tune. you will gain soo much more power if you are tuned right, you really dont want to run the car lean at higher rpm's with that supercharger. id also look into a fuel pressure regulator, one that has some sort of stepping deisgn. idk the proper terminology, but when i was at the tuners, they were using one on a 350z turbo and it basically raised the pressure with the RPM's probably using vaccum, but idk really. just keep it in mind of get one (i think an AEM one is the best) in case, even if you dnt use it right away.

I would steer far far away from the DC header. If you are going to spend money on a header, go all the way and get either a kamikaze or a custom one...especially since you are running a supercharged motor.

As for the exhaust the WS2 is not a great exhaust for a car running anything more than bolt-ons...I would rather look at an N1 or Evo2/SP2 catback.

The JR kit comes with an FMU, but after seeing it on my buddy Zack's gsr I would rather spend the extra money and get a programmable EMS (if you are able to convert to obd1 and still be able to get inspected I would go that route...if not you could always add on an emanage ultimate unit and still be obd2 and much better off than the fmu). You can run larger injectors with those ecu options and as long as they are big enough there is no reason to even change the FPR.

GsrVtec · #18 (**permalink**) September 7th, 2006, 06:53 PM

isnt the greddy sp2 also a 60mm(2.37in) pipe? Whats the difference between that and the apexi?

88 rex · #19 (**permalink**) September 7th, 2006, 06:55 PM

<---Magnaflow hi-flo cat with no issues. 2.5 in/out. Passed emissions too.

jadkar · #20 (**permalink**) September 7th, 2006, 07:04 PM

This post is gonna get "lost in the sauce" but I want to reitterate this fact because I chatted with GsrVtec the other night for about 40 minutes.......

You can run the basic JRSC kit at 6psi. People have been running this for years, you'll be fine. You WILL want to get a different ECU and tune later on for more HP and reliability, but keep it simple for now. Get your kit, get it installed and then you can upgrade later. Like I said the other night if I were moving in steps this is what I would do....

1) Basic kit 6psi
2) ECU and other fuel upgrades, dyno tune, stay at 6psi
3) Upgrade boost by switching out pulleys, go LHT intercooler, dyno retune