E21 Project Thread - Part 2

[Bassboy3313]

Haven't had ANY time to work on this thing the last few weeks. I finally got the front wheels/tires on and my old setup sold to recoup some cash. All that is left on the rear end is to fill the diff with fluid and bolt up the driveshaft to the diff.

I have been brainstorming exhaust ideas and not sure what I will do yet. One thought is side exit right in front of the rear wheel, but I would want it to be super quiet which seems hard for a side exit. The reason I consider it is because with the new e30 diff conversion, I no longer can route the exhaust above the subframe, it must go underneath, which I am afraid will hang too low for comfort. Just brainstorming right now. I guess I won't know until I get the car up and look underneath again.

[Jeff]

What size exhaust pipe are you thinking of running?

[Bassboy3313]

Planning on sticking with the 2.5"

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[Jeff]

These things sound amazing and are not very loud. I have 1 3" one on my e36 and it is quiet when cruising and wakes up at WOT. No drone is also a big bonus

Shorter one

https://m.summitracing.com/parts/flo-12512409

Longer

https://m.summitracing.com/parts/flo-12518409

[Jeff]

May bad this is the one I use it is a little different

https://m.summitracing.com/parts/flo-13012100

[Bassboy3313]

Hmm I'm liking that that first one you posted its body is only 4" vs the 6" of the correct one. The 4" would keep it tucked up where it doesn't hang lower than the floor under the car. I'll have to ponder this.

I've been brainstorming with Brian and we thought that I could run an oval section under rear subframe so it doesn't hang as low. Trouble is I'm having a hard time finding a 2.5" transition adapter to go from round to oval. Then another to go back to round after subframe.

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[wasnt m3]

Were you looking for something like these?

http://www.racemufflers.com/Oval-to-Round-Transitions-s/2021.htm

[Bassboy3313]

Yes, but as you see the smallest size seems to always be 3". I need 2.5"

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[Bassboy3313]

This may work ...

http://spintechmufflers.com/frame-clearance-tube-priced-each/

[Earl]

Will that change the sound of the exhaust at all?

[Jeff]

I like the idea of an oval section, it will give you tons of clearance

[Jeff]

Earl said:

Will that change the sound of the exhaust at all? 

It may change it some due to the way the sound waves will bounce.

[Bassboy3313]

There's always the side exit boom tube option  jk

[wasnt m3]

Dave, the place you posted has 2.5" round to oval too.

http://spintechmufflers.com/straight-line-transitions/

[Bassboy3313]

wasnt m3 said:

Dave, the place you posted has 2.5" round to oval too.

http://spintechmufflers.com/straight-line-transitions/

Yup I saw that, but figured the "frame clearance tubing" is basically what I'd be making with two round-to-oval adapters and an oval section. And it's cheaper.

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[Jdesign]

https://www.summitracing.com/parts/mpe-10416?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-magnaflow&gclid=CMaW0YehgtUCFcS4wAodUDkHvA

Why not run a round muffler/resonator mid car, then adjust the tubing to go where it needs to?

[HipMF]

The stock routing goes over the rear subframe, then under the half-shaft. With the work that he's done in that area, and the larger-than-stock tubing, it would be a tight squeeze. Running it under the subframe works but it's pretty close to the ground at that point. Thankfully, I raised my subframe a couple inches, so I shouldn't have this issue...

[Bassboy3313]

^^^ What he said

I ordered the flowmaster HP-2 resonator and am just waiting on a call from the company that makes the frame clearance tubing as they may be able to save me time and money.

[Jeff]

Bassboy3313 said:

^^^ What he said

I ordered the flowmaster HP-2 resonator and am just waiting on a call from the company that makes the frame clearance tubing as they may be able to save me time and money.

Can't wait to hear those puppies, I'm think about putting them on the e38

[Bassboy3313]

Decided to remove the turbo and manifold to see where the exhaust leak is coming from while I wait for mandrel bent exhaust pieces to come in the mail.

This may explain why my car sounded like a diesel engine last summer. Holy exhaust leak/shitty alignment batman!!!!! Don't do eBay manifolds, just don't!

I'm picking up@snap old ceramic coated manifold and turbo adapter for piece of mind. Ordering new exhaust manifold gaskets too.

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