Originally Posted by 351mustanggt
i am lookin at buying a midpipe and was wondering what the difference in sound between a o/r h pipe and a high flow catted h pipe ? also for the o/r would there be anything different in the install?
The O/R pipe will be louder and flow more without the restriction of the catalytic convertors.
For the O/R install, if it does not have provisions for your smog pump tube, you will have to disable the pump or completely remove the system.
If you do that, make sure you can still get it inspected as your local inspection laws my not allow its removal.