I have popcharger, 5/16`` spacer, stock cats, and a JIC single Ti (on the way). If I`m not willing to ditch the cats for tp`s or hi-flo`s, would the addition of an aftermarket y-pipe give me...more/about/less than 5whp? Dynodynamics said I was 243whp last time with the first two mods on board.

Great deals so far, so I`m not willing to trash the cost/benefit ratio. If I won`t notice the y-pipe`s effect on the Popcharger/spacer/JIC, then I won`t get it, of course.

Anyone have a line on a JIC y-pipe in case I go that route?

Thanks!

 

I would just as soon begin at the beginning where the exhaust gas leaves the motor: the OEM exhaust manifold (the ugly things on the floor). They are terribly restrictive. In other words the choke point is at the very beginning of the exhaust system.

 

What kind of headers ^ ?

Edit: NM, "Alphawerks." How was performance after instal and how much $?

 

I used to have Crawford HFC with the Nismo exhaust.
I put the stock cats back on(Crawfords cracked), and
I decided to put on JIC Y-Pipe to replace the Nismo mid-pipe while at it.

The result?
I lost a lot of low end torque.
The factory cats was too restrictive and caused increased backpressure.
There's no point of getting better flowing Y-Pipe if you're choked up at the cats.

My case may have been more severe because I have UTEC and
it was tuned with the HFCs.
So my advice is if you're gonna get aftermarket Y-Pipe, get HFC or TP.

 

If you're going to replace the stock y-pipe, you might as well replace the stock cats also with an HFC or test pipes. This will complement the intake mods you did (popcharger & spacer). In my case, besides replacing the stock cats & y-pipe, I went ahead and replace my stock manifolds also. By doing so, I "opened up" the restrictive areas in the stock exhaust system.

 

A y-pipe will still help even if you don't get anything else...but since the Cats are more restrictive, it won't make as big as a difference - I'd say go for it, you'll already be under the car to install the exhaust, it wouldn't take much more to do the Y-pipe too.

-Peter