i would get as large as you can and as mandrel as you can, with a .48 you honestly on a B16 not see much lag at all, but i would recommend getting at least a 2.5 inch if you could 3 inch but i know it is a little more costly
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10.02@149.5 Bullseye Power Turbos
Top Dead Center Performance
Mobile Alabama 251 661 6067
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www.tdcperformance.net