Sweet dreams are made of these: a (relatively) easy-to-develop, insanely popular product that is amazingly profitable. Naturally, we're talking about aftermarket pipes for cruisers. Following in the footsteps of Harley accessory sleepwalkers, many companies are seeing massive opportunities to sell replacement exhausts that, presumably, add character in the form of increased exhaust noise and, if they're lucky, horsepower, by freeing up the movement of expelled gas. One waking fantasy so far not realized is the instant delivery of big power. The aftermarketers are learning that Japanese exhaust systems are extremely well engineered, hampered only by regulations, not know-how.