has anybody installed the atlp high flow cat and noticed a power difference? is it worth the $325?

also can the altp j-pipe bolt up to the stock cat?

 

I had the ATLP race pipe and switched to the hfc. I feel like I got back a little bit of low end tourque I lost from the full exhaust install, but it's minor. I also think it tamed the exhaust slightly, feels a little "tighter" for lack of a better term. This is very slight though since, overall, my exhaust is still on the loud side imo. As far as if it's worth the money, tough call.

Yes, the j-pipe will bolt up to your stock cats (pre and 3rd). Remember though, if you're running a j-pipe with the stock 3rd cat, or exhaust, you'll have a minor bottleneck due to the different diameters.

 

Lose the third cat and get a race pipe. The first two cats do most of the restriction so removal of the third cat while leaving the stock two inplace will give very little gain in sound and performance. The race pipe(straight pipe) is cheaper( $100 ) and will give the max gain short of removal of all the cats.

A high flow cats is for the guys with non resonated exhausts who want to tone them down.

 

^thewanderer said that going from race pipe to a HFC didnt change the sound much

blackura has a hfc as well

 

^thewanderer said that going from race pipe to a HFC didnt change the sound much

blackura has a hfc as well

 

i wanna be able to pass emissions so that's why i asked. don't wanna delete the cat. plus i like a more toned down exhaust

 

Has he dyno'd with it on yet? I seem to recall him hoping to shoot for 300whp after it.

 

no not yet

 

ATLP HFC made no difference in sound or power from what i felt, never dynoed though.

I should be way past the 300 mark w/ the nitrous now lol.

 

75 shot?

 

50 shot for now.

 

so is it best to just leave the stock cat on if i don't want to get a test pipe?

 

Maybe try the Rv6 one when it is back in stock. It is cheaper, but more restrictive - 300 cell i believe, ATLP is 200.