has anyone actually flow tests the high flows against the stock ones? in my experience on other vehicles, the gains are almost non existent from going to a hfc cause the stockers flowed almost as good

 

I don;t know about flow tests but I just put in Fast Intentions HFC's yesterday.

Replaced this:


With this:


Each one is 8lbs lighter than stock.
My car is definitely faster. 100% guaranteed. Butt-dyno certified.

 

how much where they?

and have you messed with changing the Ypipe?

 

$520 shipped to my door. I ordered monday, had em Friday.

I am gonna be ordering up a cat-back system in a week or so and that bolts directly onto the cats... You only need to switch it out if you're keeping the stock exhaust-

 

And they didn't throw any warnings/ check engine lights/ etc

 

they shouldnt throw any lights. lights should only come on if the cats are removed or gutted, the O2 sensors sense that. i would need to see some flow improvements over stock cats before i drop over 500 on them. i dont want a louder exhaust so im not replacing the rest of it. i am sort of interested in the HR Ypipe though, or do i already have that on my 06?

 

I believe that the HR started in the sedan in 07 and the coupe in 08...
Not sure but you definitely don't have it on your 06.

As for the flow tests I'm sure that the guys who make em have done all those tests and whatnot. PM Tony at fast intentions or just give him a call and I'm sure he'll help you out.

 

cool, thanks