Thread: Quietest CAI/FWI

Originally Posted by skidoojames151

All they do if you dont have other mods is make noise and reduce milage

Don't know what kind of intake you buy, but they definitely don't do either of those things unless you drive a Geo Metro, or stay in the throttle 99% of the time.

Originally Posted by skidoojames151

have you calculated milage before and after intake? hey, im not saying that i dont have an intake cuz i do and i love it...but getting performance gains and better milage is usually like having your cake and eating it too

Intakes are proven to give better MPG's, granted I installed my intake, 3" catless downpipe, 3" custom exhaust, and new plugs/wires all in one sitting...so not sure on how much the CAI added, but I gained nearly 4-7 mpg's on the highway depending IIRC.

If it is a '04+ they don't have a U-Bend, so if your wanting better MPG's and Performance...Get the TDC FWI, ZZP Bolt-In 3" Catted Downpipe, and you'd be good to go...if you got it tuned it would get even better gas mileage though...

Originally Posted by Toasty

... i guess i hadnt climbed under the car too much, since ive only had it a month, but i swear it has a u bend (its a MC not a GP, still Series II)

Oh, guess I missed that part...anything Series III didn't have a U-Bend IMO...but if it is a Series II MCSS then it prolly has one.

IIRC it is 2" But, anything boosted and is using 2.5" is epic failure...get a 3" and let that car properly breathe.

Originally Posted by bluegtp91

IIRC it is 2" But, anything boosted and is using 2.5" is epic failure...get a 3" and let that car properly breathe.

I agree...

I have my second "I'm tired from lack of sleep, here is my dumb question" question for the day.

If exhaust is going through smaller openings out of the engine, combining together into a "medium" size pipe, and then getting put through, say a 3" downpipe (even bigger) and then reduced down again to stock exhaust after the u-bend, how is the bigger downpipe helping?

I've installed a TDC FWI, front PLOG, and a 3" catted downpipe in my 2000 GTP, and have always wondered this. Maybe it is just me being tired, but it seems that air is flowing nicely until it gets past the downpipe and then gets shoved into a smaller opening. I know that the 3" downpipe has a reducer on the end of it to make it 2.5" to hook up to stock.

It is because the catback has been dyno tested to show only flowing issues with cars making 350+ WHP. It flows very well even for the fact it goes from a 3" DP to a 2.25" catback, or whatever it is. In other cars, sure...it might be a issue, but not these

Originally Posted by nickbuol

I have my second "I'm tired from lack of sleep, here is my dumb question" question for the day.

If exhaust is going through smaller openings out of the engine, combining together into a "medium" size pipe, and then getting put through, say a 3" downpipe (even bigger) and then reduced down again to stock exhaust after the u-bend, how is the bigger downpipe helping?

I've installed a TDC FWI, front PLOG, and a 3" catted downpipe in my 2000 GTP, and have always wondered this. Maybe it is just me being tired, but it seems that air is flowing nicely until it gets past the downpipe and then gets shoved into a smaller opening. I know that the 3" downpipe has a reducer on the end of it to make it 2.5" to hook up to stock.

also keep in mind that you have other factors affecting flow before the downpipe ends( both oxygen sensors and in some cases a hi flow cat.....these all affect the flow(slow it down or cause turbulence) and the only thing after that is the res but then it splits to two pipes....even though each of the two are smaller. Anything that you can do to help reduce backpressure out of the motor will help.