So i was just curious what are the advantages of both and the dissadvantages? Also catted and catless. This will be my exhasut set up to help yall understand better. Badmab header and Megan Racing Exhaust and also possibly a fujita intake.

 

https://www.cobaltss.net/forums/2-0l...ing-lsj-66344/

 

I run 2.5 catless and love it. **** the sound of 3inch eww

 

Idk. I jus got a 3 to 2.5 figure if I need to upgrade itl be easy to cut and weld. 2.5 ull be atuck w buyin a new one If u have to upgrade. I'm curious too

 

airflow

 

hes asking about a downpipe not catback

 

Thanks Vander Im just wondering which way will be best to go and still have no idea lol

 

air flow

 

seems like ya want get a clear answer but get the 3" dp with a 2.5" exit for stock catback or a 2.5 catback.
also stay catted, our car sounds like **** without a cat.

 

Would ZZP 3in downpipe bolt upto megan racing exhaust? And will the downpipe bolt upto the bad mab header?

 

yes it all bolts up thats the setup im running right now. just get the downpipe in 3in with a 2.5in exit flange and u are in the clear

 

Got any videos or sound clips?

 

Naw the megan is loud as **** tho so it gets annoying fast