I replaced the centre muffler on my D1 TDI auto in the middle of last year with a straight pipe,the improvement in performance is noticeable,it now takes off from the lights like a petrol vehicle,there is a little increase in exhaust noise but not a lot,the fuel economy has improved noticeably,as I do a fair amount of highway and semi-rural running I find that overtaking slower vehicles easier with increased and smoother power to do so,going by my Tacho 100 kph is at 2300rpm,and that 2500 (turbo cut in) is at 107 kph by my GPS,all in all I am very happy with it now and it only cost $90 to have the muffler replaced and it took the (good) muffler home with me
cheers.
i think you would do the pump tweaks after any job like this. the only way to kow for sure is to put it on dyno. but im sure retweaking after the exhaust work you would get a little more out of it. maybe just the exhaust difference.
i am waiting till i have done all the work i want in mine before tweaking pump. i have an ems2 to install as well. looking forward to it once i get this clutch and rear main finally done.
caught me off guard at what a big job it actually is. been a while since ive pulled gearboxes out.
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