i've got the 50 hd series and it sounds good but it still seems like its restricting.

 

The 50HD is kind of restricting, but nothing like my 40 is going to be. Flowmaster is more about the looks and sound than the overall performance.If you want the best and most aggressive sounding system out there then Flowmaster is by far your choice, but if you want to maximize overall performance with a better than stock sound then you are looking into something like a magnaflow system. Both are great systems though.

 

50s are too quiet, can not hardley tell it is on there. If you can find the correct 40 thats what I would go with.