Hey all, I'm finally at the point where I'm ready to fab the back half of my exhaust for my S54 swap. Here's what I have so far:
-Megan racing headers
-E46 M3 section 1, chopped off at the resonators and stepped up to 2.5
-Two Stainless Bros round mufflers http://www.stainlessbros.com/25-SS30...ish_p_403.html
What comes next:
-2.5" H pipe
-Dual 2.5: back to a muffler in the stock location
I'm looking for input/suggestions on a muffler for the last section.
Current candidates are:
Borla Pro XS
Flowmaster Super 44
I'm actually looking for whatever is the more quiet option. The Borla is obviously a larger muffler, but it's a flow through glass pack design, whereas the Flowmaster is a chambered muffler, so I'm wondering if it's possible that the Flowmaster would be quieter. The two Stainless Bros "mufflers" that are on there now are really just more or less glass pack resonators, similar to the one on the stock E46 M3 exhaust. I think they will help quite a bit with the rasp, but they are still really loud right now. I really don't like rasp and TBH I don't think the S54 exhaust really ever sounds that great no matter what you do to it, so I'd rather hear the induction noise.
My requirements for the muffler are:
-Must be dual 2.5" in/out
-The quieter the better, I want zero rasp if possible
-stainless (304 preferably, but I'd do 400 series. The other requirements are more important)
Also to address a couple other things that will probably be asked:
-why not 3"? Ground clearance mostly. I know .5" isn't that much but it's already very low around the rear subframe, so I'll take any little bit that I can get. Noise also played a smaller role in the choice, since I don't want a lot of drone.
-why dual 2.5"? Yes, I know it's overkill for a stock S54 and 2.25 would be adequate. I opted for 2.5" simply because there are a lot more muffler/resonator options at that size. Plus, if I ever do cams/airbox on the S54 there will actually be some gains from the 2.5" vs. a 2.25".
So that's it folks, any suggestions on other muffler options I should consider? There seem to be lots of options very similar to the Borla, but I guess my ideal muffler would be something in 304 stainless that is about the size of the Borla, but chambered rather than glass pack. Does such a thing exist?
-Megan racing headers
-E46 M3 section 1, chopped off at the resonators and stepped up to 2.5
-Two Stainless Bros round mufflers http://www.stainlessbros.com/25-SS30...ish_p_403.html
What comes next:
-2.5" H pipe
-Dual 2.5: back to a muffler in the stock location
I'm looking for input/suggestions on a muffler for the last section.
Current candidates are:
Borla Pro XS
Flowmaster Super 44
I'm actually looking for whatever is the more quiet option. The Borla is obviously a larger muffler, but it's a flow through glass pack design, whereas the Flowmaster is a chambered muffler, so I'm wondering if it's possible that the Flowmaster would be quieter. The two Stainless Bros "mufflers" that are on there now are really just more or less glass pack resonators, similar to the one on the stock E46 M3 exhaust. I think they will help quite a bit with the rasp, but they are still really loud right now. I really don't like rasp and TBH I don't think the S54 exhaust really ever sounds that great no matter what you do to it, so I'd rather hear the induction noise.
My requirements for the muffler are:
-Must be dual 2.5" in/out
-The quieter the better, I want zero rasp if possible
-stainless (304 preferably, but I'd do 400 series. The other requirements are more important)
Also to address a couple other things that will probably be asked:
-why not 3"? Ground clearance mostly. I know .5" isn't that much but it's already very low around the rear subframe, so I'll take any little bit that I can get. Noise also played a smaller role in the choice, since I don't want a lot of drone.
-why dual 2.5"? Yes, I know it's overkill for a stock S54 and 2.25 would be adequate. I opted for 2.5" simply because there are a lot more muffler/resonator options at that size. Plus, if I ever do cams/airbox on the S54 there will actually be some gains from the 2.5" vs. a 2.25".
So that's it folks, any suggestions on other muffler options I should consider? There seem to be lots of options very similar to the Borla, but I guess my ideal muffler would be something in 304 stainless that is about the size of the Borla, but chambered rather than glass pack. Does such a thing exist?
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