exhaust question (not in exhaust faq)

[sd88supra]

would there be a significant difference (performance wise) between the straight thru design (like a magnaflow) and the flowmaster 40? from what it seems the flowmaster sounds better but people like the magnaflow better for performance. i suppose there couldnt be too much power difference since mine is n/a, and ill be gaining a little more gutting my cat.

[mrnickleye]

The exhaust manifold on the N/A was designed to give the engine more low end torque. Street/daily drivers won't gain with a header because it will loose some bottom end torque (what gets you moving from a stop at lower RPMs).

I like having low end power, and very seldom rev past 5k.

[rnoswal]

What he said is true about the stock manifold, but it is weird that Toyota built it that way but made the intake manifold valve open at around 4000 rpms. Just when you start making some high end power, the exhaust restricts it, then it falls flat on its face. I guess it depends on your goals for driving on the street, everyday driver or performance. There is always a trade off.

Russ

[Isphius]

Flowmasters actually completley kill hp on high powert cars, I was reading a test where they bolted some onto a 1000hp supercharged corvette and they choked it down over 200hp over just 3 inch glasspacks. But on a supra, Youd still gian quite a bit of flow over the stocker, But yes a straight through glass core or other type of muffler will flow best, and also be loud. Heres a video for your listening... 2.5 inch meinike exhaust pipe, magnaflow 2.5" fiberglass core muffler (very stright through, you can see out the other side) and a stock 7mge...

http://videos.streetfire.net/video/4...3600db0c59.htm

[sd88supra]

would there be much power difference between the flowmaster and magnaflow (straight thru) if i left my n/a pretty much stock? im aiming at keeping it as a daily driver and wont be looking to massive power gain. if having a much louder exhaust sound is gonna give me only 1 or 2 hp more then i think id stick with the flowmaster.

[Isphius]

They will be about the same power and ammount of noise. If you want to keep it quiet, Leave the cat alone and the stock piping. There was a pretty big difference in sound with the 2.5 inch piping, Because i reused the same muffler. I was going to get my cat gutted out but i sold the car might have made it sound better. And if anyone sees this \/ car in the philly/South jersey area, Let me know. I wana know how its doing!1!

[sd88supra]

i dont really think your exhaust sounds bad lol. in fact i think it sounds ok. to my ears a bad exhaust is those of harleys and civics you can hear a mile away. i dont mind that its a little loud i just dont want it sounding like a honda. my 86.5 had a crappy flowmaster wannabe muffler and i didnt think it sounded bad, and though it was a little loud (with the cat), it didnt bother me. plus im only 20, i play my music pretty loud. if in the end its too loud ill try mrnickleye's setup.

[Isphius]

And btw, I still have one of those same exact mufflers laying around if you want it, Ill sell it cheap haha.

[sd88supra]

the magnaflow? im looking for a 2.25"

[cars4me89]

I have stock headers, a 3 inch test pipe, and a 3 inch greddy/trust exhaust on my non-turbo supra and it sounds VERY nice, I always get compliments on how nice it sounds and rarely get the term "rice-burner" because of the deep exhaust note it makes.