Cut a 36mm hole right on top just before the muffler. Have to undo that clamp and move it 10mm back from the muffler. Used 35mm o.d pipe and it's thick wall tube. Did'nt want the noise resonanting out of the pipe itself. Cut the holes with a hole saw and took the muffler and the pipe I bought to a metal fab shop. They bent it and welded it for $100.00.
I was a bit worried that with the pipes on top I might have difficulty getting the muufler back in place but no issues at all. The bumper is back on and you can hardly see the pipes with a bit of flat back paint.
Not sure, but it sure as hell sounds faster Have to say it is quite loud but I guess if you do it and it's too loud then you could probably heat up the pipes and squash them a bit.
I was thinking of using a piece of flexible pipe that could be easily removed and then a plug clamped in the end so it's back to stock.
I always thought the perfect compliment to this mod would be an electric butterfly valve, like they use in Hot Rods. Then you can throttle the sound from quite to loud, a custom PSE system.
I always thought the perfect compliment to this mod would be an electric butterfly valve, like they use in Hot Rods. Then you can throttle the sound from quite to loud, a custom PSE system.
You are a genius!!!! Great idea :P However; how would you suggest going about this? lol
I would probably join the 2 bypass pipes and use a single butterfly valve, saving the cost of a second one. Packaging would be tight, but it should fit. Then it's just a matter of running the wires to a power source and switch.
Now thinking of 'tuning' the sound to my liking by inserting a capped sleeve in the outlet ends and drilling a hole in the cap. I will keep drilling the hole larger until I reached the desired noise level. Then just put a screw through it to hold it in place and so you can remove it altoghter for track days etc.
Dewolf, do you have cabin resonance between 2-3k RPM?
No, it's actually pretty quite on trailing throttle. I only drive when it when it's good weather and the top is always down so there is noise everywhere..lol.
Any chance you know the dimensions of the finished pipe assembly? I'd like to do this, but would want to have the pipe ready to go ahead of time when I drop the muffler.
Not sure if it would fit up top with 1.5". You'd probably need to run it around the backside of the muffler like Pedro's. I wanted to hide it. Would'nt larger pipe increase the noise?
Well I de-snorkled and with the muffler the car is faster. I have an E39 540iA and before the mods it struggled to keep up, in fact it could'nt. The BMW would pull away. Now the BM does not make any ground at all. So yes, it has improved performance. The sound is a killer. I am going to video some this weekend.
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