Just curious- how many here with after market DP's run test pipes often or regularly?

i do
 

on 100% of the time

Not me, have 200 cell high-flow DP cats. Don't see any reason to.

Thanks- I wonder how much power there is in test pipes. Also, how much additional sound...
 

I really like the current volume with ASP DP's and a 3" milltek.

You should have 200 cell cats as well. Will gain some power (est 15-20 WHP) and noise w/test pipes
 

Bruce

Thanks- I do have the 200 cells I believe. Sadly....
 

after being on the dyno I want to see what the car would do with good IAT(looking at water/meth and ASP FMIC), test pipes, cut-outs, and race gas on a race program.

When I rationalize it this makes absolutely no sense, becase I will most likely drive it with CATs and on 92. I guess I could ge the water meth and the ASP unit but even those most likely aren't necessary.

this thing is like a freaking drug.

It is very difficult to get good IATs on dyno as they don't have enough airflow. Better to run some
 

FATS or something similar with enough air to have reasonable IATs.

My name is Bruce and I am an S4aholic. It has been 2 months since my last mod, lol!

Bruce