Hey guys my 10 yr old flowmaster original 40s although still sound good I'm thinking about a more bullet style muffler. Two questions: which muffler pipes m-80 or LM-1s. Second question since I'm running the factory pipes should I just weld them in or buy a complete catback. Stock exhaust piping is 2.25 inches and the rest is 2.5 so am i restricting the flow with these pipes? Other exhaust is Mac LTs and prochamber. I want it a little louder and think I'll be very happy with either route but wanted some opinions.