I am currently running a 2.5" DP to a 2.5" exhaust with no cat or test pipe.

I want to run a 3" DP to a full 3" exhuast w/o adding a cat so i was told by the people that im buying the exhaust from that it needs to be hooked up to a cat or test pipe. My problem is that i cannot find a 3" test pipe and i would rather not add a cat. Is there a bypass for this problem or do i need one custom made?

I know this is probably a stupid question but i wuld really appreciate the insight.

 

If i were you seeing how your sig says 98 sleeper I would go get a stock exhaust system put on the car then buy a 3inch down pipe then add electric cut out on the end of the down pipe. You get best of both worlds. The car looks and sounds stock the. With a flip of a switch you háve open Down pipe with no restriction.

Just my 02 cents


Kev

 

just have one made. downpipes are never the same length.

 

This is what I did on my prelude and it is great. Nice and quiet for daily driving and easy to go into performance mode at the drag strip. I have been using a quick time performance e-cutout for about 3 years now without any problems.

 

the electronic cutout is a good idea i would have to look into that but even going that route wouldnt the top end suffer from an open DP?

Also, theres no readily available test pipe for 3" exhaust?

 

Well if your boosting don't worry about lack of low end. Your turbo will cause enough back pressure for the engine.

And I would just connect the dp stight to the stock exhaust

 

yea boosting.... i took a look at the pics and it doesnt look like a problem to run the DP to the exhaust w/o the cat i was just going by what the company told me

i found from spoolin a DP that has an e cutout mod.. what else would i need to have this to work?

would just running an open DP all the time be ridiculously loud?

 

People do it and it ain't as loud as open header with out a turbo. But I drive my car on long distances and I hate the loudness of any loud exhaust or dp. I am running the apexi ws2 with 3inch dp w/ electic cutout from badlandz. And it seals great I think.

The turbo Muffles some of the sound a lil. It ain't raspy to bad. Make sure you tune the car for open dp though. The turbo will love it.

Kevin

 

if i do not tune for an open DP will be there be consequences? i just retuned the other and dont have the cash at the moment for another one

 

I am not a tuner but I wouldn't recommend on hammering it when changing to open dp with out tune. But if you do I would keep an eye on your afr's while boosted. Make sure they don't get up into the high 12's or higher. Just way to lean while under full boost and load


Kev

 

would i need to retune from going to a 2.5" to a 3" . Would i have the same problem with running to lean?

 

i would just buy a 3" stainless steel pipe the same length of the cat and weld on the flanges for the downpipe and exhaust or you could cut the flange from the exhaust and extend the pipe all the way to your downpipe so all you need is the extra pipe and 1 flange.

 

Any time you change the effect of exhaust flow I would get it retuned. That's just me though.
If you don't want to mess with the e-cut. ^ that guys idea is a good one too


Kev

 

easiest thing is to buy 2 feet of piping and the hardware, install it when needed; if you cant then get it custom made, let me know if we can help with either option. if you have more questions you can email me also

 

there are also boost activated cut outs available so it will automatically open the cut out when you get on it. sorry but i dont remember the company that makes it. anyone know who makes it?

Levi