My 88 SPG is having stalling problems. I think it's my bypass valve (my girlfriend says the clamps and hoses look like they are in good shape). Since it needs replacement I figured I would upgrade. However I have noticed that group9 has some performance bypass valves that go for like $159. I am wondering if I should just buy a bosch bypass valve for like $50 from later model turbos (which are supposedly already an improvement on the stock valve). So basically is it worth it getting the more expensive valvue for $159. I am not really interested in any BOV's. The 'phssshh' sound is cool but I prefer not tossing that compressed air.