You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Z4M exhaust bypass pipes.
- Thread starter fearless
- Start date
Possibly interested in this, but not sure about fitting and longevity. Its not clear to me how these should be fitted. Is there a double skin on the back boxes? Are they welded to the outer skin only? If so, how strong and reliable can this weld be?
I don't want to ruin my perfectly good back boxes, but I would like a bit more theatre. - I did a similar mod on my old 986 boxster S which involved simply drilling 2 holes into the internal piping through the end pipes and the results were great.
I don't want to ruin my perfectly good back boxes, but I would like a bit more theatre. - I did a similar mod on my old 986 boxster S which involved simply drilling 2 holes into the internal piping through the end pipes and the results were great.
Concerns from this thread:
https://z4-forum.com/forum/viewtopic.php?f=2&t=35500&start=30
"The tail pipes are double skinned. By the look of the pics on here the pipe has just been welded to the outer skin. Now this outer skin is not air tight and in fact has two 10mm square holes either side of the tailpipe. So instead of the gas coming out or the tailpipe you will have it coming out of these two side holes. Even worse some of the gas coming from the back box will now come through these holes. This could potentially cause a couple of problems - one you may get exhaust gases coming inside the car. Also if you had a particularly strict MOTer they could fail it as an exhaust blow."
"We discussed this at Kustom101 before doing the mod. The best option is to cut through the outer trim (it isn't really a skin just a trim piece) and weld directly to the actual tail pipe. Now i decided not to bother with this, because it was more of a fiddle and the exhaust gasses are already right at the rear of the car. Also, the fit for the pipes is tight. If i notice black deposits building up where they shouldn't be I will do it as described, but looks fine so far."
https://z4-forum.com/forum/viewtopic.php?f=2&t=35500&start=30
"The tail pipes are double skinned. By the look of the pics on here the pipe has just been welded to the outer skin. Now this outer skin is not air tight and in fact has two 10mm square holes either side of the tailpipe. So instead of the gas coming out or the tailpipe you will have it coming out of these two side holes. Even worse some of the gas coming from the back box will now come through these holes. This could potentially cause a couple of problems - one you may get exhaust gases coming inside the car. Also if you had a particularly strict MOTer they could fail it as an exhaust blow."
"We discussed this at Kustom101 before doing the mod. The best option is to cut through the outer trim (it isn't really a skin just a trim piece) and weld directly to the actual tail pipe. Now i decided not to bother with this, because it was more of a fiddle and the exhaust gasses are already right at the rear of the car. Also, the fit for the pipes is tight. If i notice black deposits building up where they shouldn't be I will do it as described, but looks fine so far."