Official "custom" exhaust thread, for all engines Options

[GotToyota]

Since there is an exhaust thread pretty much every other day, I thought it would be good to make one for those looking to make their own custom exhaust. Many people tend to go this way because the aftermarket systems for our cars are becoming more and more difficult to find. Let's begin?

What size piping would be best for my GT/ST//GT4/etc?
This question really depends on your goals for the car, and what you do with it. My typical rule of thumb that has worked best for me, is 2.5" and below for N/A vehicles, and 3"-3.5" for turbo'd vehicles. The bigger the piping on an N/A, the more bottom end you will lose, however, you will gain better top end. Find your trade off point.

What about mufflers?
This is where it gets interesting. The muffler you use will determine how your car sounds. There are many different ones out there, and different types. You can have the traditional canisters, which you see mainly in the tuner scene, then there's the Magnaflow/Flowmaster type. Here are pictures showing each:

Canister:


Flowmaster/Magnaflow:


The difference in these mufflers comes from inside. Quality mufflers will have better construction and better quality inside baffling, which will bring out nice sound from your exhaust. Cheap mufflers like the ones you see on Ebay will use sound metallic and tacky. My personal recommendation if you choose to get a canister would be either the Megan Racing N1 replica ($70-$80 on Ebay), or the OBX B10 ($50-$60 on Ebay).

How do I get the piping?
Now here comes the fun part. After you've purchased your muffler and decided on your piping size, you get the piping itself. You can buy DIY exhaust kits online, which are fine if you know how to weld, but otherwise I recommend going to a local exhaust shop. From here, you can tell them what you're wanting out of your exhaust system, plus you can customize your muffler placement/angle, as well as the design of the piping, so that you can get the most straight piping possible for your setup. I paid $130 for 2.5" piping on my Supra, this included the piping itself, a resonator, and the labor to put everything on. You will want to get piping from the cat to the back of the car. Basically they cut the piping off from where it runs into your cat, and then weld on bigger piping. Many exhaust shops will NOT condone the removing of your cat, nor do I condone it. This brings problems with emissions, as well as state inspections, not to mention your car will sound like crap. I highly recommend getting a resonator added in with your piping to ensure a better sounding exhaust, you'll be glad you did it.

Here is my final result with my Supra:









I hope this will give you guys a better understanding on what to look for and get when wanting to get an exhaust system.

-Matt

This post has been edited by GotToyota: Aug 26, 2008 - 9:44 PM

[Blk94St]

I just got my new JDM 7afe today, put in monday ! Oil pan cracked, slung a rod in the original (152,000) I have had the car since late august. Early sept. clutch had went out. Had stock clutch, and the man who i bought it froms wife had been driving it. She hit a parked car... WTF?!? Fender is got a small dent in it. Anyways to the point, I go to the local Pull A Part, i just go and look around often and scope for cars i'd like to buy and have a nice lil project this summer. While walking around with a friend i found a Honda Crx, ( Had Civic cut out in the hood LMAO). The car looked like crap. Anyways, while laughing at this, i glanced down and saw a Dynomax exhaust on it. Looked it up its a muffler Dynomax and Bosal got together on. Sounds really good. Wasnt too hard to find it on youtube. I'm going to go 2.25 piping, and delete the cat.

My question is
What would i do with the O2 sensors?

BTW ... 1994 St 5 speed.

My friend also had a 1994 St Auto, he cut his cat and resonator off. SOUNDED LIKE ****. His muffler was pretty cheap, and sounded crappy. He put his resonator back on, didn't sound THAT bad, still sounded like a ricer b/c of that muffler.
Yes yes, In mississippi Not having a Cat is illegal, BUT people here really don't care as long as your not doing a drive-by.


My two cents.
I agree with the anything above 2.5 pipe on a N/A, anything bigger, sound like a ricer who's about to blow the engine. I also know in most southern states a resonator isn't required, running pipe no bigger than 2.5 with factory resonator to a decent muffler to me and many others not so raspy. The resonator muffles the sound, but not all of the sound. It helps the sound volume and the sound quality. To each their own, but different people think different systems sound like complete ****. I have a friend who has a magnaflow cat, older Greddy muffler 2.25 pipe, it sounds like crap, but so does a straight pipe with no cat or res. to a muffler, its way loud. If people can hear you over a mile away in a city than yes, its way to loud.