sup org,

ok, so i have talked to many on this. i have mixed results every time. i hear that the factory cat that is installed on our cars is a high flow cat and is a wast of money to replace. the test pie will not free up any power and the car is engineered with it so why remove it. is any of this true? is the restriction engineered? i would hate to spent the money on a test pipe to loose power and of course pollute. i dont exactly have a dyno nor access to one. ant input would be greatly appreciated.
thanks org





99, se, auto, loaded, cat-back, cai, headers, y-pipe

 

Depends if your cat is clogged up

 

500 hp race spec track car, might free up a couple horses or so. it frees up a lot of rasp in the exhaust tho

 

i dont like rasp and i dont exactly have 500 hp. whats the best way to check for a clogged cat?

 

Not worth it..

 

12" resonator, problem solved everybody is happy.

 

I know they free up and release plenty of rasp!

 

i already have a resonater im real happy with the way my car sounds i love it for an auto that is. so i guess i will be keeping the factory cat then.

THANKS ORG!

 

I have a 91' VG and i absolutely noticed a difference with a test pipe and catback, and if your on the fence on a test pipe here is a thread i just posted that might help you

http://forums.maxima.org/general-max...o-further.html

 

High Flow cat is a good option....

 

Why spend the money?
I dont see why many opt for a hi flow cat when a straight pipe will only yeild 1-2whp at the most on an NA vehicle. I dont see how a hi flow cat can be less restrictive then a straight pipe and give better gains.
I even asked Brian about this in regards to his fast cat and he didnt have much to offer.
Maybe if the OEM cat was defective.....maybe.

 

so.. what is an easy way to check if your cat is indeed faulty? would you just put your hand by the exhaust and feel for back pressure?

 

if you had a clogged cat, you'd know. you'd have codes all day. deleting the cat on a street car makes your car smell like **** and is pretty ricey. its like intake spacers or front mount intakes

 

I know your not talking about phenolic intake spacers...

 

really? haha

 

The length increase in the runners coupled with the lack of heatsoak will help. Its proven itself many times.

 

Yea, if you have a clogged cat you would get a rotten egg smell. I have no cat but a big *** resontator to keep the noise down

 

resonators ftw

 

Cattman Fastcat ftw