im going to cut the mufflers out of my system and go with a straight pipe on the sd. basicaly just for the sound

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1981 300SD 512k OM603

i dont think the muffler creates back pressure , does it?

when my welder is hooked up im going to make my own muffler

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1985 300D - 599,xxxk - blue interior #265 Monark Nozzle, AL129X, 15" Ronals, Gen II Big Brakes hunting
1985 300D - 491,xxxk - in prog-{A-A IC, 3" exhaust, psi\pyro, 28*BTDC, Hella Euros, IP Limiter removal
1985 300TD - 783,xxxk - parts car,used new engine with ALDA cap inplace
1987 Kenworth T-600 8LL 425 CAT Mech. - 6,000,000+k - DEI exhaust wrap, punched through resonators, 1 recent rebuild,

The stock exhaust only has about 2psi of backpressure above 3000rpm. The turbo is more restrictive than it.