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accu fab is more expensive and it only gives 1 hp more then the pro products combo. I went with pro products 75mm t-body and plenum and love it. only prob was the throttle cable linkage had to be reamed out but it was a 2 min fix. thing is great way more throttle response
go with the c&l plenum and i guess which ever tb you prefer. i went with the accufab because i was young and didn't realize i payed 200$ for it. you'll need at least cams to get 310hp
70mm is smaller then a 75mm lol. more air = more power if you plan on staying N/A a 70mm will work fine but I always go with the ol adage bigger is better in this case. wont notice any power difference between the two till ya go F/I, thats what my plans are.