Opinions on Big Bore Throttle Body

[dsobering47]

Hey, i have a 1987 325is, and I was wondering if anybody has purchased the Big Bore Throttle Body from BMP Design. I was curious to see if it was really worth the investment ($300). Also, would it really affect my car that much? The only modification I have done is a cone-air filter and heatshield.....

thanks

 

[rjp325i]

I thought about it as well but the improvement comes in at the high rpm range so it does not help much for a street car. Other mods must be used in conjunction with the large bore TB to see big improvement in performance. The biggest improvement for the buck is still a Conforti chip for $199.

 

[bahnstormer]

exactly once u've removed most of the flow restrictions then adding the larger TB will provide large gains in the upper rpms..meantime get an exhaust and port polish your heads