Hussain wrote:it sounds more like a V8 then anything. and i don't have to worry about that because it's an electronic exhaust cut-out, if i have my nephews or sister in the car i'd have it closed and the only real time you need it open is when your racing or going fast and in that case you'll either have the windows up OR at the higher RPMs you'll already be blowing air pretty hard so it wont just go into the cabin, it'll get blown under the car and to the back of the car
You might be surprised at how much of the exhaust will go into the car regardless of how fast you're going.
Another thing to consider is going to be heat. You want to make sure there are no wires or hoses anywhere around the exit. Exhaust gases are VERY hot and they will melt things. I just showed my buddy his melted brake lines on his F-150 and the exhaust is about two feet or more away from the lines...