A BOV will lessen performance in a variety of ways:
1. When it vents, you are losing metered air which makes your un very rich (notice the black cloud you often see as you hear the noise).
2. Since all but one have a spring, they respond slower than the OEM air based design
3. Since they have a spring, they only have an "ideal" range of boost they can be set for. The OEM valve works perfectly regardless of psi ... more importantly it works exactly the same regardless of psi.
4. NO aftermarket valve has the by-pass feature the OEM has. This gives you faster response and greater fuel economy.
This was in relation to the 3sgte. What you guys reckon? Aftermarket blowoffs just rice for posers or an integral part of any performance engine.[/quote]
the only possible place to fit one wuld be on the s shaped curved pipe from the turbo to intercooler.and that spots bout an inch long. 
looked at doing it on my st185 and it really aint worth the hassle. i looked at 5 or 6 st185s wen i was looking for mine and none had them. they r helpful to prevent compressor surge , which will eventually damage the turbo , but u shuldnt get too much anyway til ur over 13psi.which u shuldnt really b running on a ceramic anyway 
me good at breaking things. So getting it done by my work, sure it's gonna cost me but at least it'll have a gaurantee. Although after reading your post... Ripping the engine out myself will save me a couple hundy... might see what my mates doing tomorrow. It will be towable without engine gearbox? (cept for brakes?) I just very new to all this. Wires and music I can handle, scary things scare me 
