Originally Posted by romanonj
We more then welcome to explain the differences into detail. Shoot us a message or email.
Some people just buy fmic based on cost, others on quality of matierals, and others based on performance or a combo of all 3.
When seeking the highest quality materials crasftmenship and performance we recommend the Evolution Racewerks and ETS, both made in the USA too.
Performance wise many perform simiarly, you can only gain so much power from an FMIC.
The difference between 5 and 7 inch normally is that the 7inch will be less prone to heat soak and will perform better for road racing or very hot climates.
Lots of people think the FMIC they have is "GREAT", and im sure it is good but others are better then some in the ream of heat soaking or lack there of.
ON a single gear pull they should all perform similar. Typical gains are 15-20WHP from all of the popular upgrades.