Down to three and need help...
in the next few weeks. (FYI this is a dd) only about a 10 mile radius everyday. Thank yall so much for the advice There is a big difference between a 321/237 and an MS3. I would go 233/239 over a 231/237, assuming the 231 is similer to (or is) the TSP grind and has less extreme lobe profiles.
Other than matching the converter stall speed to the cam's powerband it's a matter of personal tastes.
What cat-back do you have?


