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Hello all. Just put on my Two Brother's Racing slip on and boy is this thing deep. My F4 sounds exactly like my partner's ZX9 with full Muzzy set up. I thank everyone who suggested the Two Bros. I am very happy with my purchase. Now it could be just in my mind but I was never able to pull the front wheel up under 5000 rpms but first time I cranked the throttle, the front wheel was up at around 3500. Scared the shit out of me!!!:hurl: :hurl:
I also want to thank everyone who suggested parts411.com. They had the best price by 30 bucks over everyone else. Took me 15 minutes to install, and without having to re jet, this thing responded like a champ. f4 owners looking for slip on.... In my opinion, Two Brothers is the way to go.
 

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I'm with ya man! I put on my D& D bolt on (after much deliberation amogsnt the threads), and I SWEAR, the wheel comes up ALOT more easier. Smoother power delivery? Perhaps. A bit more HP? Perhaps. I dunno..but all I know is the bike DEFINATELY has a more predictable powerband with little, if any, dead spots.

I Love it. Glad to hear you like the Two Bros. Maybe next time I get a bolt on with another bike, I'll explore the Two Bros pipe.
 

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I, too, went with 411.com and it took longer to removed the stock bolts than it did install the can. Very happy with it.

D&D $293
411.com $242
 
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