Review on Silent Performance: Unleash the Power with MBRP M1004A Universal Quiet Tone Muffler by Johnny Grant

Bought for 99 Power engine with 4" direct exhaust and single injectors. The noise level at idle has practically not changed. The noise level in the cabin when driving on the highway has been significantly improved. The noise level at 65 mph (measured on my Android) went from an average of 79dB to an average of 74dB. I didn't notice any increase in emissions when driving uphill without a load. I haven't tested the load yet. , i will try to update after i do it. It's nice to be able to have a conversation without shouting.