Originally Posted by
Siegel Racing
We run 35R's on LOTS of stock blocks. I'd suggest the 0.63 hotside. I'd also consider the AMS or the P&L kits...
Siegel
Everyone talks about compressor surge on a 2.5 with the .63 housing using a GT35R.
Originally Posted by
Element Tuning
...Running the 35R with a .63 exhaust housing is like running a 2" exhaust on your car. It's just not going to make reliable power on a 2.5 liter Subaru. This is a mismatched combination and you could get better performance with a bolt on turbocharger. Also with such poor spoolup (4500 rpm?) you want to be rewarded with massive power and the .63 won’t deliver it. The .63 is a better match for something like a 50 Trim. ...Phil.