I just fitted a pair of 26 inch Smitties to my 54 h/t. I fitted Graham cast iron headers with the Smitties mounted close to the front, 2 inch pipe in, 1 ¾ inches out. Good sharp rap for an otherwise stock mill at anything over 1,200 rpm - maybe too loud for a cruiser, we'll see. When I looked under the car, the mufflers were fitted backwards, with the inlet arrows pointing to the rear. When I called the muffler shop, they said that they fitted the mufflers so the louvers inside were facing into the gas flow. So, before I take it back school me, are the louvers meant to face the rear, or are the inlet markers wrong on my mufflers, or should I just turn up the highway hi-fi and sit back and relax.