hemihead

Thanks Looks like all that stuff was removed when the did the exhaust They plugged the 2 small pipes by the rear shock with vacuum plugs Both of them were rotted and i assume leaking . So i replaced them..we will see if that fixed it or not. I dont see anything up front. Could there be something there also they could of plugged that i cant see ? ? Just tried it and it still pops

have a 2000 royal star venture. Just bought it. I can rev it up and hold it around 2 grand and it starts popping thru exhaust. Now i think it has aftermarket pipes, seems louder than my other Ventures. Just synced the carbs, came out fine , sprayed carb cleaner around the intake boots looking for any leaks. Nothing found. It seems to me like a lean popping. Can the aftermarket exhaust cause this?? Or what else could cause this Thanks