STILLEN Exhaust & Gen 3 Intake Dynos - 18hp Each!

Denny McLain

After trying a couple different cold air intakes and literally throwing a Breathless Industries cold air intake (piece of crap) in the trash, went back to the stock intake. The car lost about 12 hp instead dynoing 472 SAE (481 std) it went flat on top around 460 rwhp telling me it was incapable of flowing enough air.

Instead of digging the Breathless out of the trash; examined the stock setup very close, it appeared there was no room directly underneath the K&N filter. I took a stock filter, cut the guts out and used as a spacer. The car dynoed in the 470's again. Removed it completely and the car dynoed the same w/ w/o, so the intake is not an issue if additional space is provided under the filter.

Proof is in the pudding, dyno sheet also on that website...........highest N/A street driven LTx C4 on the Corvette Forums. Just a matter of figuring out how to make things work and the smooth billows are not necessary.

Speaking of......... "How to make things work". The general conscience at the dyno shop yesterday is to do twin turbos. I agree, but I'm going to play a bit more tweaking a N/A setup as my observation and conjecture is there is power to be had in a tune and exhaust. The exhaust systems looks weak and that will be my next project but already having second thoughts about buying a Y pipe. Like the true dual notion better but I've been wrong before.

We'll see what the dyno says.