Updated exhaust setup

[BBDirtbiking]

For a real ceramic coating you need to take it to a shop, they run usually around $200 for an inline 6.

[SwiftE30]

I didn't know you could ceramic coat the inside, thats awesome. Does a shop have to do it or is there a DIY way to do it?

[Jand3rson]

Copy that. I was unaware that they were coating the inside of headers. Makes perfect sense!

Not every place does it, and if they've been on the car already, there's a good chance they won't be able to sandblast the insides of them well enough to create a clean bonding surface. You have to make sure that you request that the inside is done, as well.

[johnjohnsons54]

This. They are inside/outside coated, and since the metal of the headers is so thin, the ceramic coating gives them a dense new coating, and deadens the vibration in the metal, which is what causes the rasp in the first place.

Copy that. I was unaware that they were coating the inside of headers. Makes perfect sense!

[Jand3rson]

^The ceramic coating inside and out removed his rasp.

This. They are inside/outside coated, and since the metal of the headers is so thin, the ceramic coating gives them a dense new coating, and deadens the vibration in the metal, which is what causes the rasp in the first place.

[BBDirtbiking]

^The ceramic coating inside and out removed his rasp.

I haven't got my exhaust on yet, but I will be rocking my 3 foot resonator in hopes of killing the rasp, it worked on the M42 and that was BAD.

I just hope the free stainless steel exhaust I got isn't too loud, or I will have to pair some different mufflers with it that I have laying around.

[johnjohnsons54]

Much appreciated Janderson. Looks like a fine setup you have there. I'm particularly fond of the way the whole thing tucks underneath as well as the dual tips that shoot straight out the back. Any guess as to why yours has no rasp at all, even without cats?

I'd like to think my shop could merge my headers together with a y-pipe as well as jam a cat in there before the first muffler.

Be sure to post up a sound clip if you ever get the chance to make one. I, for one, would love to hear it!

Any opinions on the Aero Stealth mufflers (to be used instead of a borla for the mid muffler) that are also for sale through verociousmotorsports.com?

http://www.verociousmotorsports.com/Shop-by-Category/Mufflers/Aero-Exhaust-Stealth-Muffler-S217

[Jand3rson]

I'm using a 2.5" single in/out Borla ProXS, and a single 2.5" in Vibrant StreetPower. My headers are ceramic coated ebay Supersprint reps with a Flowmaster 2-into-1 Y. The whole header/Y assembly is ceramic coated, and I have NO rasp whatsoever. Perfectly quiet at idle, and loud when you get on it, but it sounds amazing while out just cruising around. And when you stand on it, it sounds SO MEAN. I do get some crackling/popping when I rev-match, but other than that, it's really perfect. Tucked up in there nice and tight, too.

Here's a couple shots of the headers:




And here's the completed system welded up under the car:

[johnjohnsons54]

I'm considering going from my shorty headers -->2.5in pipe---->a cheap cat (suggestions?)--->borla----->vibrant dual outlet

Can anybody suggest the ideal Borla, and Vibrant models for such a project...not sure about muffler lengths and offsets etc?

I'm assuming a good shop should be able to tuck all of these pieces neatly underneath the car.

I'm thinking it should be pretty similar to Polak's but with a little less volume and rasp due to the cat.

[nando]

The one thing about the Vibrant is that it by itself is LOUD! I ran a straight through resonator before the borla, and it was pretty obnoxious.

what type/length resonator did you use? think it would be any louder with a resonator/cat/vibrant muffler? you get any fuel smells at idle? I like these because they look and sound pretty good and come in the size i want. plus they're cheap. :p

[evil_twin]

With that muffler, how did you get it so it doesn't swing around that much? Where did you mount the hangers?

[e30polak]

Curious.....

.why did you guys choose headers over the ss obd2 ex mani's?...


here is a vid of a 2.5 single on an M20...w/ headers...MF hi flow cat.and borla muffler....would you call it raspy?.or not?.

A little raspy, but that's the character of BMW's inline 6 engines! That car sounds quite good actually!

[e30polak]

I have 535 mounts and my ebay headers fit without it shimmed, but they touched the heat sheild, I shimmed it and they fit mint. And there is enough room that I didn't have to shave my intake manifold or nothing.

Same thing for me. I flattened the heat shield on the body after seeing that they touched.

[SamE30e]

Interesting a bunch of the stuff I read said the 535 mounts need shimmed and the m5 doesn't. Either way glad the headers fit!

I have 535 mounts and my ebay headers fit without it shimmed, but they touched the heat sheild, I shimmed it and they fit mint. And there is enough room that I didn't have to shave my intake manifold or nothing.

[JRKOUPE]

I bought them and my THR adapter from a fellow BMWMOFO member here in OK.

gotcha....