I am sure you will get a lot of responses here. I looked at all the options and went with the TWM system. I think they are owned by Borla these days. The only thing I would have done different is I sometimes wish I would have waited a year or two...only b/c when I put mine on there was near as many fuel mgmt computers as there are now. Some of the ones out there now are supposedly A LOT simpler to install and set up. PM me if you want more details and i can share some of my research. Hopefully some other folks will chime in for you as I am not a engine builder..just a Cobra lover