Review on FMF Racing 41133 Exhaust Header by Jaye Cleveland

FMF makes the best whistles on the market in my opinion. The bike has definitely gained power and responsiveness. With the other mods I've made (JD Jetting, exhaust bypass, 13 tooth rear sprocket and FMF Racing Q4 S/A MFLR) the bike just isn't the same. It runs quietly, has plenty of torque and is very responsive. and it even starts with a punch! The PowerBomb header and Q4 trumpet were the finishing touches and made a huge difference, although for those worried about noise it's a little louder than the original if you get the Q4 with it. It's not bad, but it's deeper, louder and about 5 decibels more. It's not really a problem, it's still a quiet car, just not the ultra-quiet moped sound of a stock trumpet. I haven't tried it without the Q4 so I can't say how it works with a standard whistle. It's very well designed. Highly recommended - looks great too!