Hey guys, wanting to get some wrench turners ideas and thoughts about a recent dyno run. I have a 06 Mastiff. I of course have the 117 Ci, originally it was the EPA regulated motor. After talking to S&S and having a shop do the work it now is a non EPA regulated motor. S&S drop shipped everything that I needed to get the most out of the engine. The only known upgrades is a .600 S&S Cam, a Kerker 2 into 1 super megaphone without baffle, the BD Spike air cleaner. I'm sure its the factory ignition system, and no torque cones. Even tho I'm running the .600 cam I don't think the heads have been shaved and I'm not even sure if the cam springs were changed? But S&S says this would be the same kind of motor that BDM ordered except with a bigger cam. But before tuning the bike, on the first run I had about 108hp, when he finished I was at 123hp. The mechanic told me that the breather and exhaust pipe didn't like each other, that with no baffle that I was losing about 5 to 10hp. And I needed to change pipes, or get a tunable pipe. I love the loudness of the pipe I have cause I am a firm believer that loud pipes save lives, not to mention I turn a lot of heads with the sound of my bike. My question is what is your advise. I want the most hp out of my engine, but I honestly don't want to give up the loudness or sound of my bike. Do I change the breather, or do I change the pipe? Do I break down and have it bored, ported and polished? I don't want to sink a ton of money into the engine, and with the going from EPA to non EPA I already have over $3000 in parts and labor. But the mechanic says I should be putting out about 140hp. Is he blowing smoke or not?