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i had a guy (who is know for doing good work here in town) offer to bore me out to 70mm for about $150...personally Im going to spend the extra money and get IL4 TB (70mm) so i can keep my factory parts.
a 70mm TB is probably one of the last mods you should put on your car. If you only have blot ons my sugestion is to get an ECU. Usualy bolt ons make more power when you have it all dialed in.