Re: 2.5L power improvement
The one thing that you can all be assured of: if it has the CARB sticker on it ..........it is going to do virtually nothing for you. Borla's own dyno test show that their CAT back system ......doesn't produce any added power til over 5000rpm........does anyone frequent those light speeds? Oh....it'll sound nice.......and if you have an older motor (not your 4 banger) throwing on a 4.0 head with the injection and such (HEI etc.) will 'bring you up to speed" and show remarkable improvements over older hardware ..... but for the contempory crowd .......virtually anything that really adds any punch .......will increase the emissions .....hence it will not have the CARB sticker on it. This is why I feel that most of the stuff we see for "engine enhancements" fattens the wallets of the vendors more than it broadens our power bands. You'll note that although the TC site mentions x-xx hp gains......it doesn't show WHERE that power kicks in.......more than likely its in a rpm range that you'll rarely see. I bought the TC rock-it tube to reclaim the air box space.....that's it. If it makes commuting 70+ miles a day a little more economical [img]/wwwthreads_images/icons/laugh.gif[/img].(ya....ya..buy a geo metro)[img]/wwwthreads_images/icons/laugh.gif[/img].....so be it.
Throw a set of 4.88's in....then you may actually attain the rpm ranges where these products provide their added juice....that should give you all the pull you need and you're still under 3000rpms at 70mph with a set of 33" tires.