"quiet" is a relative thing, here we have a 90Db limit for road cars, seriously doubt a 4" anything will get even close to being legal, on my project car I run twin 3" with 6 mufflers and 2 cats and it's "legal", in the past on Mk3's I've made my own centre muffler and a twin 2.5" system with...
5mm max on the shims, any more and you risk coil binding and runaway pressure at high rpm, Most of the brand new pumps I've bought were built to the loose side of the specs and are most likely responsible for the low hot idle pressures people complain of and the total and utter BULLSHIT that the...
Did this in my Mk3 using the Chev Pump and a PPS Rack/MoTeC, you have to set up a variable voltage channel to control it as you're driving a valve to a position, I can dig out a file if you need numbers.
Most "old" racks will have a wear mark in the tube around the straight ahead position so...
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