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Guess I finally figured it out. The HKS Racing bypass valve is about four times larger than the stock Bosch unit and at least twice as large as the Stratmosphere unit. Cost was $153 plus $10 for the steel weldable flange. Not much more than the Strat. unit but does require custom welding. I have mine set at 18psi. It works very nicely and although it is recirculating it makes a nice "kooshh" sound between shifts.
Cliff
'86 SPG 210K
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