Hi just brought this muffler second-hand. Its a HKS super drager muffler

I noted that it was a 2 1/4" inlelt but the inside was not directly straight thru.
It seems to be straight thru to different parts of the muffler.

Also the inside is only 2" internal, but i can't see how the back is...

Is this muffler gonna affect my performance? I was told it was quiet which was why i brought it, but i though HKS mufflers would be highflowing also.

Anyone got one? how would you rate the performance?