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I also have an A1 and I have thought of doing the same thing but such a big block as the 250 the noise would be out of this world. Yes it would benefit a free flow exhaust but not enough to support the noise. I have opened mufflers on non turbo motors and experienced more torque. I cut open one...

is your stack vertical or side exit like stock? I can't say mine is this level. I ran a straight stack almost level with the cargo cover height.

I have the soft roof on this A2. You can hear there is more noise but it's a different noise plus I routed the noise up so it has nothing to reflect. The side exit hits walls and things but vertical has nothing to reflect the noise back to the cab. I would say 15% more.

I was tired of the lack of low end on my one of my A2's and I did not want to mess with the pump so I removed the muffler yesterday. The stock muffler was 2 kilos more than a new muffler for it was full of soot and rust. To install the straight stack I had to use the stock elbow below but this...