Exhaust size for 396
 

I have a 66 Velle SS convert
I need new exhaust header back
Anyone know if a x- pipe will fit in 66? I have a 700r4 trans
If x will not fit will H ? Or am I stick with direct duals all the way back?

Also pipe size, I assume stick to 2.5". 3" is too large for 396. 350hp

2.5 will be perfect. Either an X or H crossover will fit. Magnaflow sells a header back system with an X. The fit is very good, they offer it in 2.5" & 3". Pypes also makes a good fitting 2.5" or 3" system with an X crossover. Both good quality, the Pypes system runs a little cheaper.

A 2.5" system is plenty of a baby big block. You don't want the fitment hassles of a 3"

I agree, 350hp little big block. 2.5" is great plenty

I was considering flowmaster super 40's
Anyone not like flowmaster?

I don't.
But, mufflers and their particular sound is strictly a matter of taste. I personally love the Pypes Race Pros...much less restriction than any Slowmasters.
Dynomax Ultra Flows are good too.

From my experience, the flowmaster tail pipes do not fit very well and require tweaking. Their mufflers drone too much for my taste. I prefer the sound of Magnaflows or the Pypes mufflers. JMHO

I prefer Magnaflows. the Flowmaster drone and exhaust note just arent for me

I had Flowmasters on my 55 Bel Air ,the drone sound as mentioned already made me not take it on long trips .

I am going to change my Flowmaster this year. I to agree there is too much drone, especially on long trips.