so i was talkin with a couple of my buddies one drives a 03 cobra another drives a crx we were on the discussion of cat or catless downpipes would it help or hurt me to get a catless. do we even need anykind of backpressure or no bc if we do i was gonna get a highflow cat instead of catless. by the way mine is an 06 supercharged sry still kinda new to this ****

bump

 

i say go with a highflow cat, that way cops wont mess with u. and i dont see a real gain of going catless on a non turbo'd car

 

i have a catless and straight pipe and honestly it was cool at first and no you dont need back pressure but it was cool and all at first but now that ***** getting annoying with the sound and my turbo is small and had HELLA sound coming out but your supercharger wont limit the sounds from the exhaust so for you it will be ridiculous.

i wouldnt ever pull anyone over for their exhaust no matter the law but thats just me.

 

don't want to get into a whole big thing, but engines don't need backpressure... backpressure kills performance and is one of the reasons why you would go with an aftermarket exhaust, though majority of people don't know that. that's why it's important to get a properly sized exhaust.

as far as catted vs. catless, without a cat will give minimal gains over a hi flow, imo i don't think the raspy sound justifies the 2-3 extra hp.

 

x2, backpressure is the enemy of performance.

im catless, i dont know if it adds any power over a high flow, but at least i dont have a cat to clog up. it will change the exhaust tone and if you dont get the code deleted you will get a p0420.

 

heres a video of my gmpp headers, zzp catted dp, and magnaflow muffler

and this is from the inside of my car with it
http://www.youtube.com/watch?v=vvWS0...e=channel_page

 

so pretty much if i feel like listenin to a loud ass exhaust go catless but if not go high flow
thanx guys

 

yup exactly. I recommend going with a high flow cat because I enjoy loud exhausts and when I had no cat I wanted to kill myself lol.

 

without the cat isn't only loud, it could be very raspy and shitty sounding.

 

pretty much dead on

you don't want to hear how loud an LSJ can get, its rather ridiculous

 

i have a zzp catless dp with my gmpp exhaust...its not really bad at all. for me not annoying at all.. just loud as hell haha

 

check out my sig for what i have, i just bought a cti catless downpipe, my buddy has the same setup and his sounds amazing

 

Yes there is prolly 5hp in the cat.... so if you want the most power get a catless....

if you are in a strict air quality state... then get a catted.