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Basic exhaust question

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Enjoi577

Proven Member
79
0
Jan 15, 2014
Peoria, Illinois
The muffler on my stock 98 gsx has rusted through, so I need to replace it. As my goal is 300-350whp, i figured now is the time to just get a whole new exhaust setup. I really like the sound of the apexi n1, but have heard that muffler rusts easily and the piping isnt a true 3inch all the way. So, can I just get a custom 3inch catback exhaust done from a shop and put the apexi n1 muffler on it and still get better performance/ the sound i want?

I was also thinking of the thermal r&d, but if its cheaper and ultimately the same upgrade to get a custom exhaust done and wielding on whatever muffler, than thats what Id rather do.

If this is the case though, why does any one buy a full $700, $800, $900 exhaust?
 
I never did on my cars but the last one i got came with megan racing set up turbo back, any shop can make you one depends, money can be spent eslewhere unless to me.
 
Ebay exhaust is the best bang for the buck. Lets face it, 3" pipe is 3" pipe.

People pay 7-8-900 for the name. Thats it.

You can get an ebay SS setup for less than most shops will make a 3" SS exhaust, and I've run quite a few ebay exhausts on DSM's and other cars without any incident.
 
I bought a good muffler offline and let the shop do the rest (eclipse). Cost 181 to install everything from down pipe back. Shops will have a mandrel bender usually so the bends will not be true 3" all the way around the curve but it will be pretty close.

That being said, what I did on my Talon is an electric cut out. When you run at the track, open it up. When you're on the street, close it when it's just casual driving and to not attract unnecessary attention. You can do 3" pipe and then a quiet muffler on the back. But like others have noted, I don't see the point either to spending 700-900 on a pipe...
 
Ebay exhaust is the best bang for the buck. Lets face it, 3" pipe is 3" pipe.

People pay 7-8-900 for the name. Thats it.

You can get an ebay SS setup for less than most shops will make a 3" SS exhaust, and I've run quite a few ebay exhausts on DSM's and other cars without any incident.

I second this comment I bought mine off of Amazon though. It was $150 sounded great and never gave me any problems.
 
So, just to be clear, I can buy the Apexi N1 muffler, and tack that onto some 3 inch pipe from the cat, back and thatll be just as good as any? Then add a 3 inch DP later. But my main issue is it sounding right, want it to be mean but not so much like a tracter. Apexi and thermal are the ones iv pretty much set my sights on. I dont need to look into buying a resonator to match the sound? Also, how will this affect performance, because i still only have the stock turbo, is this going to bog up my car and not allow it to perform as well if not better than with the stock 2.5" piping?
 
It will perform better than 2.5"

I would say just buy a "n1 Style" ebay catback. Piecing together your own will get a lot pricier very quick.
 
Alright, that makes sense actually. Buying the N1 style implies that it SOUNDS like the N1 as opposed to LOOKING like the N1...right?
 
You're over thinking it. A 4g63 with a muffler is going to sound 90% the same unless you run some crazy muffler.
 
Just to be clear and I mean no disrespect but you do want mandrel bent, it uses a shoe inside the pipe to keep it from crushing. Most muffler shops just use a normal bender which crushes the pipe down smaller at the bends. If I was you I would try to buy a couple of mandrel bent pieces that you'll need and bring them to the shop.
 
The ebay way may be your more cost efficient way. Press bent exhaust is not necessarily terrible it should still support what you are trying to acheive. Dont jump on buying the mandrel bends unless your plan on welding it yourself. A shop talked me out of welding up some mandrel bends after I started asking about cost. Muffler shops will charge more for the labor on this as opposed to buying the piping from them, and letting them make the exhaust for you. I like the Magnaflow mufflers myself. If you decide to go with the N1 syle muffler remember to check the measurements of inlet if you are worried about true 3in.
Some of these are 2.5 in or in mm which equates a little larger than 2.5in.
 
Alright, so it looks like the sound of my car won't change too much then? I'm planning on putting in. K&N cold air and a turbular exhaust mani kind of soon. Then add a better BOV and move to the turbo. I figured it'd make it sound better but seems not really? Bummer. Anyway, ebay seems like the most cost efficient route, so I'll probably end up buying a 3in apexi n1 style catback. I'd much rather have mandrel bends too, but hoping this does what I want. Ill look i to buying the bent piping and seeing what thatll cost to have a shop put it together, but i dont even know where to look to get the right angle bends. I'll put it on myself and post some pics, for the life of me I can't seem to find a very easy comprehensive step by step guide. Iv never done anything like this, but if I buy new hangers and bolts, what could go wrong right?
 
I just got done redoing my entire exhaust with 3" piping and a Moroso spiral muffler all from Ebay. Total cost for everything including autozone hangers and Home Depot 3/8" rod for hangers was right around $200. I fitted and tacked the entire exhaust system in place, took it back out, finished all the welds and re-installed it. The sound of the exhaust is awesome and there is MUCH more "uhmph" through my entire power band. I bought 3" smooth bent exhaust from Ebay that came in a bundle of 1ea 90, 1ea 180, 1ea 45, and 1ea 30 degree bent pieces. I only used one 90 and the 180. It also depends on how you route your exhaust as well. My 3" downpipe is also from Ebay. It was $75 shipped I believe. Had to cut the flange off and re-position it, but it worked for me, especially for only $75! Don't be scared to do it right the first time!

Ebay links :
Exhaust Builder Kit 3 inch Mandrel Bent 180 45 60 Degree 90 Degree | eBay

Moroso 94051 Spiral Flow Muffler | eBay

Enjoy!
 
Ebay exhaust is the best bang for the buck. Lets face it, 3" pipe is 3" pipe.

People pay 7-8-900 for the name. Thats it.

You can get an ebay SS setup for less than most shops will make a 3" SS exhaust, and I've run quite a few ebay exhausts on DSM's and other cars without any incident.

You realize there are different grades of Stainless steel right? Not all grades are the same and some will rust where others will not.

I had a Megan Racing but have replace it with an HKS.
 
Is it difficult to swap cams? I know that's probably a loaded question... I'm aware of different steel grades, so I'll have to keep an eye out for that as well.
 
I sent you a private message about this, but the part I was talking about was the straight pipe. Would any steel 3 inch straight pipe match up with the eBay mandrel bends that would connect to whatever 3 inch muffler I decided to use? How will this affect a DP Id like to later put in? I' paranoid that after buying exhaust parts, later Ill find the DP I wont fit, or that wont fit with the O2 housing or that wont fit with with the exhaust manifold... How do I make sure that all these parts match up? Is it as simple as just making sure all the flanges are the correct size? And that would imply to me that pretty much any sort of piping or fitting I would need would be available in many different sizes? sorry - No0b here
 
As long as it's 16 gauge 3" ID a d the flanges are all 3" ID itll work, dont use anything lower grade than 304 stainless.

If you use a thicker wall tubing on some pieces, or a 3" OD your pipe will either not be a true 3" ID or your pipes won't match up and won't weld as uniformly. It would be nice if you could source everything from the same place. Or buy a megan down pipe and piece the rest. I have a megan down pipe and worked great. And didnt have any failures. I am on a side exit now
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The bends need to be correct to fit up to the o2 housing.
 
Your probably better off picking it up locally at a pipe manufacturer. I couldnt tell you exactly how long it should be but 4' sounds closeish.

Honestly a pipe is a pipe is a pipe, as long as the material is of good quality and the welder is decent at what he does it won't really matter where you get it from. Or if you buy a megan exhaust or obx or what ever.

I'm only throwing these tips out cause it sounds like youd rather make something custom
 
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