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You did fine Soren ... one heck of a lot better that I would do in Danish ;-) .... At one of the Canadian Volvo Club shows I attended, I saw a 142 with dual pipes ... what the owner had done was split the dual down pipes and continued them at the same size all the way to the rear of the car .... NO MUFFLERS .... MAN was that baby LOUD !!!
I agree with the others ... two cylinders into a 2" pipe just will not flow. The system I had built consists of a 4:2:1 stock exhaust cast iron manifold connected to the usual dual downpipe ... then I had a 2" pipe back to a MAGNAFLOW 14" muffler ..over the axle and into a 10" bubble style resonator. Sounds great flows excellently and I don't have to worry about the damn headers always coming apart either at the block or at the collector as the HOOKER set I had on my '72 Cortina GT used to do ... that was truly annoying and eventually I had to go back to the stock manifold .
At first I had just the Magnaflow at the very back .... that was loud enough to be very annoying .... which is why I added the resonator and moved the muffler ahead of the axle .... I have heard that if I had just moved the muffler and not added the resonator I would have had a noticable reduction of sound too ... has something to do with wavelength and where along it the muffler is located. One thing I have noticed since I did the final muffler work is that all the cars in the Club that I AutoCross with sound almost the same .. 2 liter 4 cylinders that is ... and I think MOST of them are running a MagnaFlow/Flowmaster and their Catalytic converter ... having a pre CAT car has it's advantages :-) .
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Brett Sutherland & the 1.5 million mile 122 CANADIAN www.ecvintagevolvo.com
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