i would go with the tial. more specific the tial 40mm.
it is a little more expensive, but a favorite around many other crowds..
TiAL 40mm Wastegate
40MM Wastegate Features
• Nickel-based alloy is used for valve and 347SS valve housing offers longer product life compared to competing designs
• High temperature silicone Nomex reinforced actuator diaphragm
• 17-7 PH stainless steel actuator spring gives consistent pressure at high temperature; resists "relaxing" at temperature to 900F (483C)
• Nitronic 60 stainless steel is used for the valve seat, and valve bushing
• All stainless steel hardware
• Color anodized aluminum actuator (Titanium gray Std) Red, Blue, Violet available in 1999
• Available spring pressures:
.4Bar (5.8psi)
.6Bar (8.7psi)
.7Bar (10.2psi)
.8Bar (11.6psi)
.9Bar (13.1psi)
1.0Bar (14.5psi)
1.1Bar (16.0psi)
1.2Bar (17.4psi)
1.3Bar(18.9)
1.4Bar (20.3psi)
Compare the materials used, long design life, overall appearance and quality. We think dollar for dollar it's the best value, period.
40MM Wastegate .4Bar -1.1Bar
40MM Wastegate 1.0Bar-1.4 Bar
TiAL 40mm External Wastegate
Price - $375 w/flanges
http://www.agpturbo.com/turboacc.htm
now it all depends on how much boost you want to run. the 40 mm is a great one for running low boost and getting excellent response.
the 36mm (cheaper) is for running slightly higher boost than the 40.
either way they are all damn good products.
why arent you all thinking about using externals from innovative?