[GoGoat]

I have a 69 FB with a mild 350 that needs exhaust. In the future I might install a 455. Can I install 2 1/4 or 2 1/2 now for the 455 later. How will the 350 perform?

[hal101]

great

[paint guy]

Originally Posted by GoGoat

I have a 69 FB with a mild 350 that needs exhaust. In the future I might install a 455. Can I install 2 1/4 or 2 1/2 now for the 455 later. How will the 350 perform?

If you KNOW you are going to install a 455,you would be better served putting in the 2-1/2"system,IMO.But it is a bit of overkill for a 350.Let's put it this way,you'll have an easier time time living with a 350 with 2-1/2" exhaust(temporarily)than a 455 with 2-1/4",because you'll always wonder how much better it would've been with the 2-1/2".JMO,I'm hoping others who know more about this will chime in.

[69Customs]

I run my 350 with summit headers into 3 inch cross over with electric cutouts. When cutouts are closed it goes thru 2-1/2 pipes to mufflers all the way back thu 2-1/2 tail pipes. it works great!!!

If you don't want to hear the other guys engine at the strip, I just open my cut-outs and I can only hear my engine. It also works great at traffic lights when straight pipe Harley's pull up beside you!!!

Go 2-1/2 you won't regret it.

[chiphead]

I ran a full 3" exhaust on a warmed over 350 before I bult the 400. I didnt notice any loss of low end torque with the 350. Low end response likely depends on the cam and what top end you're using on the 350 engine.

[Pontirag]

You should not notice a difference in performance by installing a 2.5 system behind a 350. You may have to richen up your mixture a bit but not in every case.

[bonneville Joe]

If you are having the system made by a local shop, the cost should be the same either way. 2.5" would be a better choice, probably sound better and you've got a ton of room for improvement unless you build a 500hp plus motor.