someone I know with a coupe just put turndown's right off the mufflers last week with a set of flowmaster 40's. sounds mean and all but the drown at 2000K on the highway was awfull. I tried something tonight and it worked. I backed off the clamps on the dumps and turned both of them inwards so they were facing eachother and tightend them back up. He went for a drive and said the drown was almost not there anymore. anyone else ever try this