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RE: Upper intake plenum... what does everyone have?
Accufab makes a quality part that looks great under your hood. I also think it dynoed a bit higher than the rest of the competition. Super easy install. I suggest you do the intake shuffle and change the plenum, TB and CAI all at the same time. They are designed to work best together and will give you a nice little boost in performance. Don't expect huge gains unless you have a Cobra. You will definitely notice a difference in acceleration smoothness and throttle response.
RE: Upper intake plenum... what does everyone have?
I got the professional products 75 mm TB and Upper intake. They work great. Some really nice power gains showed up when i paired it with a nice big CAI. Sounds really mean too! That big ol 75 mm sound makes you think back to old 4 barrell mustangs.