Symptoms of a Bad or Failing Throttle Body Common signs include dirt, grime, and carbon deposits on the inside of the housing, electrical problems, vacuum leaks, and a very poor or high idle. By Jeff Engstrom on January 12, 2016 Share Tweet Pin. Jan 24, 2010 SRT8 owners with a 87mm throttle body. The butterfly covers the entire bored out hole. Then when at WO throttle the butterfly is turned 180 degrees to unrestrict flow. How can this change the amount of air flow. I can see if your intake was not ported for the throttle body, that it would be a waste to put an 87mm or 90mm on it.:4-dontknow.
Stock srt8 throttle body worked to create a better transition for air to flow through. Opening is 84mm and has a nice transition into the throttle blade unlike some of the 85mm and 87mm that use stock throttle blade still and have a horrible ridge and bad transition just to give it the visual effect of a huge tb. I only charge $100 for this service as I think that's about the most something like this should go for. This mod will help with throttle response and over all air flow but I won't put a bs HP number on it like most. Check me out on face book at 'mack built'.