Hey guys,
I'm stuck on my decision about what catback system to get for my vortech. Currently the only engine mods i have are the crawford plenum, colder plugs and 3.12 pulley on top of the vortech system running at 10psi. Exhaust system is completely stock. I've been hearing some ppl telling me to go true dual while others telling me that I need the backpressure from a non-true dual. Either way, I was thinking either the nismo or fujitsubo if single is better or injen if true dual is better. Any suggestions? Here is my latest dyno, had to let off on initial run cause previous tune was for 93 octane.

 

wow!!! looks like your making 400whp n 344wlbft with those mods thats awesome i was looking at getting this kit or a single turbo, but every other dyno i've seen it makes no where near the amount of torque tht a st does, but yea back on topic, i'm na right now but love the nismo exhaust not to loud but sounds way better than stock

 

Good question. I am ruining a Stillen's dual, Stillen test pipes, Crawford headers, I did also add some resonators to cut the buzz out. I like this set up.
The test pipes are the most restrictive part of the system, due to there dia. like maby 2"?
I was going to go to a 3" test pipe but, I herd from quite a few that this would not produce enough back pressure, and loose some lo-mid.
Your #s look great!

 

Thx for the comments, but what about true dual vs. single? Thats the real question I'm trying to get answered....

 

Go with the Stillen or Borla. But you may want to add some high flow cats also.

 

If you plan on leaving stock headers, cats, I would go with dual.
If you are going to change headers, cats, you could go with single.
You need to create some restriction for back pressure. Either in cat. forward or cat. back.

 

I am using Kinetix cats with the Nismo and love it!