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

Originally Posted by Denny McLain

Guys

New to the 370 list as I just purchased a new 370Z the end of last week. However, pretty darn salty at hot rodding cars being a former dyno shop sponced racer currently owning the highest hp N/A street driven C4 on the Vetter forum. This particular car has had over 1000 dyno pulls and there is literally nothing stock in the engine. 12.5 to 1 398ci trying 3 different of heads and a dozen different cams to get the combo worked out. Time for a new challenge.

With that said.........In a new learning curve and I'm looking for effective mods and objective independent dyno restults to back up their effectiveness. And.......no, I don't trust any of the shops and yes.....I know the dyno tricks.

I have some issues with this Stillen post. First, they are an old reputible shop and posting individual results from an intake and exhaust is nice; but why isn't the results of both posted?? Something doesn't appear exactly right to me.

Already tried to purchase (if the frickin shop will call or e-mail me back) a set of high flow cat as that makes sense. Will have the car dynoed bone stock for a rwhp and fuel/air baseline. Will install the cats and will post the results.

In looking at the exhaust, I see quite a bit of room for improvement but the stock intake doesn't appear all that bad. So exactly where is the restriction that causes the 18 hp loss??

The stock intake is cold air with twin filters which appear to be more than sufficantly large enough to support 300rwhp plus. After trying three different intake systems on my Vette I went back to a modified stock setup with a K+N filter. The car currently makes over 470 rwhp and has made as high as 480+ with the same modified stock intake.

So where is the objective independent results?? I'm a buyer!! But, ya got to prove it to me.