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straight exhaust #293497 Oct 6, 8:26pm Oct 6, 8:26pm
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straight exhaust
is it bad for your car to run without the mufflers or run just a straight pipe

Re: straight exhaust [Re: 04silvergts] #293498 Oct 6, 8:31pm Oct 6, 8:31pm
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you ll lose back pressure without a muffler and it ll be loud as hell

Re: straight exhaust [Re: SmutasticGT] #293499 Oct 6, 8:43pm Oct 6, 8:43pm
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I knew that I was really just wondering if it could cause any problems to the car... its just temporary I ordered the n1 exhaust and they sent me world sport so I sent it back and im waiting on the n1...

Re: straight exhaust [Re: 04silvergts] #293500 Oct 6, 8:46pm Oct 6, 8:46pm
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Shouldn't hurt, it's just illegal.

Go for it, but be careful.


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Re: straight exhaust [Re: slidr] #293501 Oct 6, 9:14pm Oct 6, 9:14pm
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anything from the cat back is just sound man, and youll be dealing with a lot of that


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Re: straight exhaust [Re: eric_h] #293502 Oct 6, 9:20pm Oct 6, 9:20pm
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? are you saying that if I leave the cat on I wont loose backpressure?

Re: straight exhaust [Re: eric_h] #293503 Oct 6, 9:32pm Oct 6, 9:32pm
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Originally Posted by eric_h
anything from the cat back is just sound man, and youll be dealing with a lot of that

Actually, the exact opposite is true. The current group of headers gain almost no power, and the piping from the header to the cat is 2.5", the biggest you want to go on NA. When it comes to exhausts, however, you can gain over 15hp with a catback (Kazuma), and at least 10hp with an axle back (TPR). Not too shabby. wink TPR will come along with the header power soon. thumbsup

Originally Posted by 04silvergts
? are you saying that if I leave the cat on I wont loose backpressure?

Nope, the cat is pretty free flowing already and will hardly affect backpressure. If you go to a 2.5" catback, the reduction in backpressure will hurt low end power, but will make for a better flowing top end. The stock midpipe is pretty free flowing already (resonator is straight-through and perforated), so by adding just an axle back, you can gain low end AND top end, and control exhaust noise at the same time.

Re: straight exhaust [Re: Blue_Bomber] #293504 Oct 6, 9:42pm Oct 6, 9:42pm
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Do you know where I can order a kazuma (I know theyre "offroad use only")... if I didnt care about the noise or tickets wouldnt I be getting a lot more power without exhaust confused

Re: straight exhaust [Re: 04silvergts] #293505 Oct 6, 11:06pm Oct 6, 11:06pm
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You can get the Kazuma here for $340:

http://www.trdsource.com/partsintrslts.php?model_detail_id=41&part_type_id=100&parts_id=172

You'd actually lose power by running with no exhaust, since the piping helps the exhaust gas pulses flow and pull each other along (scavenging). Without that, the engine would need to do more work to push the gasses out, resulting in less power than a straight pipe.

Re: straight exhaust [Re: Blue_Bomber] #293506 Oct 6, 11:42pm Oct 6, 11:42pm
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would a custom straight pipe have the same effect as the kazuma

Re: straight exhaust [Re: 04silvergts] #293507 Oct 7, 12:04am Oct 7, 12:04am
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Yup, as long as it was mandrel bent and used 2.5" piping. It'll be louder though, unless you use a resonator at least as big as Kazuma's.

Re: straight exhaust [Re: Blue_Bomber] #293508 Oct 7, 12:24am Oct 7, 12:24am
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mandrel bent?

Re: straight exhaust [Re: 04silvergts] #293509 Oct 7, 12:37am Oct 7, 12:37am
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Yup, some shops have a mandrel bending machine. It can bend piping while maintaing the same inside diameter through the entire bend. However, most shops have crush benders, which just collapse the pipe in order for it to bend. This causes a ton of restriction, and is good for only OEM replacements on cars that the owners don't really care about performance. Mandrel bending is more expensive, but it's the only way to get decent power out of any exhaust system. All aftermarket exhausts are mandrel bent, including Kazuma, TRD, TPR, Tanabe, Apexi, etc.

Re: straight exhaust [Re: Blue_Bomber] #293510 Oct 7, 12:47am Oct 7, 12:47am
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so I could just get a custom straight pipe mandrel bent and it would put out about the same as kazuma

Re: straight exhaust [Re: 04silvergts] #293511 Oct 7, 2:23am Oct 7, 2:23am
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Most likely. There's nothing really special or power-enhancing about Kazuma that couldn't be reproduced by a decent muffler shop.

Re: straight exhaust [Re: Blue_Bomber] #293512 Oct 7, 6:58am Oct 7, 6:58am
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I've got a straigt pipe on my car. It's pretty loud and sometimes I get tired of it, but then I just turn the music up. Its also nice to have when people try to out rev you... and when you hit lift. thumbsup

Re: straight exhaust [Re: Veilside Celica GTS] #293513 Oct 7, 1:54pm Oct 7, 1:54pm
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I can hit lift while reving in nuetral smile

I still put down more N/A torque then anyone else just about and I run no muffler smile

beware it will be loud as hell and be heard for a few miles in lift. you have been warned. thumbsup I am however lookin into the tpr exhaust even though I hassle them a lot (it's all outa love smile ) lol

they do after all have the highest dynos so far and is supposed to be rather quiet.


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Re: straight exhaust [Re: Blue_Bomber] #293514 Oct 7, 2:43pm Oct 7, 2:43pm
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Originally Posted by Blue_Bomber
you can gain over 15hp with a catback (Kazuma), and at least 10hp with an axle back (TPR).

thanks, i needed that info... thumbsup

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