Originally Posted by JETT
Can any one tell me if it will hurt me to go with 2 1/4" off the manifolds in to a single 5" pipe to the back on my 1992
non turbo 7.3
Your Best off running 3" pipe from the Y pipe back the manifolds back. 3" pipes are what comes with all three after market turbo kits and has been the standard for the Past 20 years as the upgraded exhaust pipe for the IDI's. If you want to have a 4" pipe, just run 4" from the muffler back it look big at the tail pipe and sound louder too. IDI motor's just don't blow that much to need 4" or 5" even with turbos. 3" pipe with a Flowmaster or a glass pack with 3" inlet and outlet will work great. If you have a turbo on your motor just run Strait 3" all the way, you'll love the sound.
Most Powerstroke guys are running 4" and that fill the needs of many. 5" is great for 600 hp plus motors witch is more power then an IDI will ever make.