yes its noticable ,its kinda like a lightened flywheel mod (quicker revs ,more torque sooner ),it starts easier ,mine pulls harder off idle for sure, its only 140$ with wires/coils etc. and whole 9 yards. its a really good mod IMO
and the coil is so overlooked , it is the heart of your engines spark ability. midcal racing on planet sand , nology actually has their own site too, also id check out hollywood dirt
and some otherts i forgot right now. its worth it and is cheap HP IMo