The catback of the exhaust system is good, the precat side is terrible. The driver to passenger crossover pipe is a whopping 1-5/8" OD. PATHETIC. This is smaller than the downpipes on my 300SEL. Frank Reiner stated the biggest jump for least hassle, I agree. I have standard Euro dual logs on mine scrounged from a 500SEL, nice jump in power for the cost. Are the four piece manifolds from the 300hp M117 better? Sure. Are they worth the price premium? Not to me as these give you most of that power at a fraction of the cost. Another benefit is removal of that precat putting all the heat into just one cylinder bank.

I did keep my main cat and obviously the O2 sensor. Car passed smog for the few years remaining before it went exempt due to age. I wish I knew of Duke's trick when I was smogging these cars with aging cats!

EGR delete did not trigger a CEL on mine (ECU too old for this, just has O2 to trip the light) and it was so caked up at the intake entrance, it was plugged shut anyway. This was at 150k when I did the top end. I left the valve on the manifold until my car was emissions exempt for the visual impact.

AIR pump only works at start up, easy enough to remove it if you have to. Mine was seized so I did...just plug all the other vacuum connections to it accordingly. I TIG'd mine shut at the intake. I think some went to the throttle body even. Been years since I had it all apart, cleaned, and sorted.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]