Why is the stock muffler on my 2015 F-150 5.0 so HUGE and heavy? The same on my 2013, too. Very hard to replace if you just want to install a performance muffler only, and don't have the funds for a complete "catback" exhaust. Is there a similar size replacement performance muffler to reduce the incredible amont of work replacing the stock muffler? I sure could use some input, 'cause I'm low on income, but high on prformance!