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Hello. I have an UIM ported for a 62mm throttle body that I want to get a TB for. Is it better to get a 62mm so it's the same size all the way through or will I get better results from a 65mm? Thanks 
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Well, If I where you, I'd get the 65, then if you didn't feel like porting the whole plenum to 65mm, then just taper the opening from 65mm to the 62mm slightly.
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New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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me...if i'm spending the 275 for either TB, i'd get the bigger. the 9mm increase will be nicely noticeable.Andy
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fastest 1/8: 10.19@ 67.17
fastest 1/4: 16.16@ 82.70
62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.
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Yeah now that I think about it I guess it's the obvious choice. Even if I just bolt it on now I can always port the manifold later on. Thanks for the ideas guys.
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