Best downpipe to bolt to stock cat?

[tntdsm]

Basically seeking a good downpipe that I can bolt up to stock cat, preferably 2.5 any advice would be much appreciated, reason why seeking better performance while maintaining stock cat for emissions, thanks.

 

[toecutter]

VRS is pretty good

http://www.slowboyracing.com/more.php?id=1431&

 

[tntdsm]

Thanks for the input, but will that bolt directly to stock cat without any modifications?

 

[DGajre777]

Why not get a bigger cat?

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http://www.roadraceengineering.com/eclexhaust.htm

 

[zippyshoe]

Why not get a bigger cat?

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http://www.roadraceengineering.com/eclexhaust.htm

Good suggestion! Also, if you are upgrading your exhaust system, its usually recommended that you upgrade from the tailpipe toward the engine (cat-back exhaust, then high-flow cat, then downpipe, then O2 sensor housing, then exhaust manifold) to reap maximum benefit from your upgrades. Hope this helps!

 

[tntdsm]

thanks again guys, I have already had a shop in town weld on a 2.5 system cat back but it begins about 5 inches from the rear of my cat , as they would not bypass the sensor that is there so have to utilize stock cat , so still need a 2.5 downpipe that will bolt up to a stock cat, thanks again for taking time to help me.

 

[1badturbo]

thanks again guys, I have already had a shop in town weld on a 2.5 system cat back but it begins about 5 inches from the rear of my cat , as they would not bypass the sensor that is there so have to utilize stock cat , so still need a 2.5 downpipe that will bolt up to a stock cat, thanks again for taking time to help me.

Thats what I had done and that 5 inch section hurts the prefromance. You better off buying an o2 bung and welding it onto another piece of 2.5 inch piping and then gettng a d/p that removes the cat all together, the less back pressure the better.

 

[tntdsm]

Thanks, but I cant weld and I cannot get the shops around here to do it thats why it still has that lil section with the sensor, so if there is any place that makes a 2.5 that will bolt up to my stock flange would be great if not looks like I wasted my money having the catback done oh well looks like im screwed thanks guys.

 

[1badturbo]

well you can still get a d/p that gets rid of your can and you'll still get gains as oposed to having the cat tsill

 

[tntdsm]

Thanks, but the flange at the rear of my cat is the same size as the flange and bolt pattern as the front of my cat, so a downpipe that deletes the cat would also still have to connect to the flange that used to be at the rear of my cat so stil needs to bolt up to stock flange if there is a cat delete downpipe that bolts to stock exhaust flange would work, if anyone knows of any because all the vendors I have been calling say there is not?

 

[1badturbo]

Thanks, but the flange at the rear of my cat is the same size as the flange and bolt pattern as the front of my cat, so a downpipe that deletes the cat would also still have to connect to the flange that used to be at the rear of my cat so stil needs to bolt up to stock flange if there is a cat delete downpipe that bolts to stock exhaust flange would work, if anyone knows of any because all the vendors I have been calling say there is not?

I have a megan 3inch d/p, and also that 5 inch piece that the second senser is connected to like you have, and the d/p also deletes the cat go to there site.


http://www.meganracing.com/products/product_detail.asp?prodid=56