exhaust question (not in exhaust faq)
 

i have an 87 n/a and i wanted to upgrade the exhaust. i was thinking of gutting my cat, sticking with the stock 2.25" piping and putting in a flowmaster 40 muffler. would using the stock piping work well with the n/a? i read in the "exhaust systems researched" thread that 2.25" pipe without a cat is the equivalent to 2.5" with a cat. since i am a starving college student, i wanted to stick with the stock piping since i dont wanna spend too much $$$ on a new custom exhaust. i dont expect a large power gain, but id like my exhaust a little more free-flowing, free up a couple horsies.

as for emissions, ill just throw a cat back on to get it smogged :p

would there be any issues to look into (engine-wise) when not using a cat?

You should be ok with just 'gutting' the old cat. Or you could get a 'test pipe' to stick in place of the cat.

Either way, the exhaust will be louder.

BUY A HEADER!!! That will be the best thing you can do for the exhaust. If the engine is stock and N/A then keeping the system close to stock size is best. I gutted the cat and put on a nice free flowing muffler on the back of my daughters 87 N/A and it sounds real good. I have the same system on my Turbo and it is quite a bit quieter due to the turbo muffling the exhaust note. My daughter drives the N/A and I love the sound hers makes when she pulls up and when she leaves.

The straight six has such a nice sound to it. The only thing better is a V12. I would like to hear an exhaust that exits in front of the rear wheels, shorter and meaner sounding I bet.

Russ

wasnt there a video here of an mk3 with a side exit exhaust?

but i love the idea of giving your daughter a loud car
that way
you dont jus love it
when she comes and goes

you'll also know WHEN she comes and goes

oh, thank you, im gonna keep that in mind when i have mine

straight thru design?
 

ive been reading up on mufflers and i was aiming to get a flowmaster 40 which apparently aren't straight thru design. straight thru design i guess is best (helps increase exhaust speed). i was thinking of going with flowmaster for a deep tone (i hate fart can rice mufflers), but how does the tone and volume (and performance) of a flowmaster compare with a magnaflow? a lot of magnaflow guys tell me flowmasters are nothing but name and are better suited for american muscle cars. if the sound is too loud i suppose i could add a resonator (as mrnickleye did). and i remember isphius saying he didn't like his magnaflow... open to suggestions/opinions :dance:

Don't worry about it sounding like a can of bees. The four cylinder cars almost always sound that way. The six cylinder cars sound more like a really nice tuned exhaust on a large four cylinder motorcycle. Some can be very loud but the six cylinder has the 2 extra exhaust pulses that soften the note. V-8's usually have one side separated from the other and have a nice rumble but still loud. The 180 degree headers for a V-8 race care sounds really nice though with all the exhaust pulses merging together like the cars at Daytona.

You almost can't get too loud with a small six like the Supra, but the exhaust can build up an annoying resonance at certain speeds. I went with a flowmaster on both cars and like I said, I like the way my daughters car sounds the best and that is without the cats on both. We can still get away with that here in Louisiana.

But I really don't even worry about the noise because of how loud most Harley's are around here. If they don't get pulled over for drag pipes on the bikes, then there is no way our cars can get pulled over for noise, just for acting crazy, which can be fun!

Just make sure the rubber mounts are used and not solid mounts. Go solid and you will feel it in the car as well as being too noisy inside the car. A good sound system helps, but not all the time.

Russ

flowmaster vs magnaflow
 

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.

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.

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

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

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.

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!

http://i42.photobucket.com/albums/e3...a/b34f04f3.jpg

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.

Generally the supra motor just has a nice tone, So odds are no matter what you pick you might like it. And when you hear that allll the time, it can get a little irritating. I would like to be able to switch easily.

looking at your 86.5 makes me miss my 86.5 and my 87 before it was wrecked (remember the "firestone wrecked my supra!" thread?). im hijacking my own thread, but oh well, i got everything i needed to know. thanks eveyrone.

my 86.5 *sigh*

http://i30.photobucket.com/albums/c3...t1/carpic2.jpg

my 87 on the dreadful day it was crashed :(

http://i30.photobucket.com/albums/c3...reckesupra.jpg

my 87 the day it left the body shop (same as it is now lol, slow and painful recovery)... did the '89 front conversion

http://i30.photobucket.com/albums/c3...ucket1/car.jpg


Edit - Made you IMGs work - isphius

how the hell does html work on these forums???

And yes, I remember that firestone incident. I never trust anyone with my car. Im affraid to get the alignment done on my mr2 :( those techs love fast cars. Do you have an extra driver side outside door handle laying around btw? lol.

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

the magnaflow? im looking for a 2.25"

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.

Get a video!! and about that muffler, my grandpa is an Ahole! he threw away all my car parts! including my n/a intake manifold that i spent about 10 hours porting, cleaning, and polishing, my 2 mufflers I had, a perfectly good spare tire, and a whole exhaust system for my monte carlo. /cry!!!

that sucks! i hate it when people assume extra car parts are trash. thats why i keep my spare parts in my room :D

i dont have an extra door handle, but theres a junkyard around here with like 4 or 5 mk3's (engineless) so im sure i can get you one. i need to replace mine as well (among other things), as it got messed up when my car got broken into.