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the chosen one · 02-20-2019, 01:34 PM

From what I could tell on my Katech ported throttle body, most of the porting was on the front side to eliminate the step you see on the stock part and both sides of the blade bar. Since the adapter goes in the rear of the throttle body I don't think it really restricts the airflow. Now if you port the intake manifold too, you might want to eliminate the adaptor or have the inner diameter of it enlarged to match.

I have the GM CAI with the GM tune and the TB made a noticeable improvement to the throttle response.

02-20-2019, 01:34 PM	#23
the chosen one Drives: 2017 Convertible 1SS A8 Join Date: Aug 2018 Location: Detroit, Michigan Posts: 82	From what I could tell on my Katech ported throttle body, most of the porting was on the front side to eliminate the step you see on the stock part and both sides of the blade bar. Since the adapter goes in the rear of the throttle body I don't think it really restricts the airflow. Now if you port the intake manifold too, you might want to eliminate the adaptor or have the inner diameter of it enlarged to match. I have the GM CAI with the GM tune and the TB made a noticeable improvement to the throttle response. __________________ Kooks 1 7/8" LT catted headers, Katech Ported TB, SoCal ported IM, Green filter, Tuned by BCP, Borla S-Type axle-back, BMR springs, BMR front sway bar endlinks.