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Stock tb is 63mm I believe. I have a professional products 70mm tb.I had to make one of the holes bigger so it would bolt up to my elbow but other than that I'm happy with the product. It makes a cool whistling noise too ( yes I know you can fix it but I like it[8D])
When you install your headers bolt it up to the heads before the h pipe it will make your life alot easier!!!
installed the t/b gotta say im pretty impressed throttle response is in alot better and ive got the whistling noise as well i kinsa like but just out of curiosity what causes it?i didnt have time to do the headers cause i gotta have the car for work in the morn but the install on the tb was pretty easy had to widen the holes on mine as well