POWERHOUSE MOTORCYCLES has been building and tuning turbo bikes for 35 years; we are a Hahn, Velocity, Mr. Turbo and RCC dealer. We have seen it all, done it all. Our best kit - and best selling turbo systems - are the RCC kits. There are several good reasons for this, but let me comment on Hahn turbo systems:
For a long time they were a good Stage One kit for stock motors at a good price, with some negatives, namely: their mild-steel headpipe is a POS that will crack severely after about a year of use. If you are lucky, it won't drop the turbo on the ground while you are riding (crashing) the bike. The exhaust note gets very loud all of a sudden and you know something bad happened. Also, the Super 16G Mitsubishi turbo with the internal ("flapper style") wastegate will spool quickly and put a smile on your face until it "spikes" and sends your boost over 10 psi, usually resulting in melted pistons. BIG NOTE HERE: STAY AWAY FROM THEIR GEN 2 SYSTEMS, THEY GO TO 8 PSI BOOST WHICH IS INSTANT DEATH FOR A GEN 2 STOCK MOTOR. Fit and finish is poor, and God forbid you need to call them for any tech assistance or replacement parts: they DON'T ANSWER THE PHONE. Even as a dealer, I have had to email them and wait three days (at least) for an answer I needed yesterday. I would stay away from Hahn, you get what you pay for.
RCC turbos - as everybody knows - has the only turbo system in the world that is warrantied for TWO YEARS. Richard at RCC is ALWAYS available, I am always available at POWERHOUSE, and I am sure that ROB at Boosted Cycles is always available and ready to take your questions and calls. POWERHOUSE gives all org members a discount on RCC systems, we are their #1 dealer in the USA. Do yourself a favor - I don't think you would buy your best girl a fake diamond - put the best turbo system available on your bike, you will have the backing of at least three great turbo gurus and dealers and no regrets.