thanks for the input guys. i decided to go with the 60mm setup, i just ordered one online for $63 if anybody is interested, i got it off this website.

http://vr-speed.com/store/invidia-hs...pe-p-9194.html

comes with cel fix.

 

Yes all OEM s2000 exhaust systems are 60mm, and yes even a 60mm test pipe on the OEM exhaust will help and give you a couple HP. You just have to remember that our S doesnt react much to bolt on modifications unless you get a full EMS and get it tuned. Even then you can spend $4000 on bolt ons and a tune and still have less than 240whp.

 

Has anyone tried one of the fake cats that Silicone Intakes is selling? The product description on their site is hilarious.

http://www.siliconeintakes.com/produ...09d2d4e55522f6

 

I kind of agree with what other people are saying. I would try to match the size with the exhaust. However my test pipe is a little bigger at 70mm. I don't remember what my comptech exhaust is at but I am sure it is smaller. I think a 60mm test pipe would be perfect for an NA setup unless you have a larger catback exhaust and want to match it. I would guess on an NA set up you wouldn't see much gains in the sizes if any at all.

I would get the 60mm invidia with the Cel fix if you are NA. I have the 70mm version and it works just fine. That is of course if you are going to go with a 60mm catback and not 70mm. I would stick with the invidia either way with either a 60 or 70mm. They are cheap, work great, and many people have them on s2ks with zero issues. I wouldn't touch anything megan and the 63mm is kind of an odd size and you probably wont get an exhaust to match up with it (I believe 63mm is 2.5in but most exhaust for the S are either 60, 70, or 80mm).

 

(Sorry Daily Dumped, don't mean to highjack your thread), but I didn't realize simple bolt on mods would require tuning. Really just thought a TP would be a cheap way to improve the exhaust sound as well as add a little more efficiency. The only other bolt on I have is a PRM performance intake.

My question is would these hurt the engine without an EMS or ECU tune? If so, I'll go complete stock until I have the bucks for a supercharger, exhaust & EMS.

 

no it is perfectly fine to add bolt ons. it will increase somewhat horsepower that you can feel just a little. but i can understand if you get internals you have to get a hondata or other piggy back ecu or stand alone.

 

Yeah you can quite a few bolt ons and still be safe without a tune. I'm just saying don't expect much without it though, i've gone through 3 different exhausts, probably 4-5 different intake setups, swapped my OEM cat for a test pipe, swapped out the header for a JVT header and didn't notice much of a difference. Even when I swapped the exhaust and intake back to OEM there was almost no difference except for the sound. If I was to have all my bolt ons and get a tune, thats when I can get the full potential out of my parts and everything. Some people have done a bolt on such as a nice header, and actually lost a few HP, then when they got it tuned they gained maybe 5whp in the end over their baseline.

A test pipe is going to give you maybe 2hp if you just bolt it on, and might give you 5-6whp if you have it tuned with an EMS. That goes for most of the bolt on parts for our S.

 

I have a TP and a fuji exhaust and flashpro loaded with the Toda tune and I can tell you it makes a lot more than 5-6 hp, in the midrange and low end there are big gains, maybe not so much in peak power but it is a significant difference. At least on the 06+ models with a tune there are significant gains to be made with just a TP and a tune.

 

So you're saying you make a lot more than 5-6whp with just the test pipe alone with the tune? Or is that including all of your exhaust and such also? I just don't see someone making over 6whp with just a test pipe, and since you say you have a fuji exhaust i'm assuming it's a 60mm? I know it has a lot to do with the tune, but I wonder what the exact difference is..OEM cat with the tune, and with the test pipe with the tune. That's really the only way to tell exactly how much you made from it.

 

You quoted this. A test pipe is going to give you maybe 2hp if you just bolt it on, and might give you 5-6whp if you have it tuned with an EMS.

The biggest gain is coming from the addition of the TP and tune since you cannot lower the vtec engagement point below 5500 with the stock cat, then yes I would say the gains are more from the TP and tune. When you run the "tuned" program in flashpro it is for a stock car and vtec is set at 5500 I believe, even with an exhaust you still cannot lower vtec any lower. The addition of the TP removes the resonant hump associated with the stock cat allowing for more power. OEM cat with a tune and TP with a tune there is a big difference.