Doing a oneball exhaust, need pipe diameter...

[madsedan]

Going to purchase a 90 degree elbow to do our own oneball in the garage on my 06 R53, was wondering if anyone knows the diameter I need to get before I get under the car and start measuring?
Thanks in advance.

[ScottinBend]

This will be difficult as the transition needs to be in two directions. A simple elbow won't fit correctly as it also needs to be bent down a bit to match up with the muffler.

[madsedan]

Cool, I'll let the muffler shop figure it out, thanks.

Do you like the oneball on your car?

[ScottinBend]

Yep, can't justify getting a new exhaust when this is good for me. Not as loud as the aftermarket ones, but still sounds nice and very cheap.

[madsedan]

For future reference if anyone stumbles across this thread, the stock is about 2.25" diameter.
Several of the skilled "oneball" installers actually cut and reuse a section of the pipe from the split to the removed resonator to weld in the new spot so it doesn't really require much (or any) new pipe.

[SilverBeam]

I'm probably going to do this mod this summer as well. Let me know how much it ends up costing you and if there is anything I need to let the shop know before I do it.

[ScottinBend]

Cost will depend on the shop.....anywhere from $50-100. Nothing really needs to be to difficult. If you can get the car on a lift so the shop can see what needs to be done it should be very straight forward. If not, just do a search on NAM for a diagram of what needs to be done. There are some great images to help you out available.