Fastmax

Does anyone have an educated (not a wild) guess as to the horsepower limitations of a set of Hooker 2055s flowing into a Hooker 3" catback on a 400 CI engine?

Air_Adam

You'd probably be good to 400hp or so, but whats the rest of the engine built like? Are you using a cat?

Fastmax

The rest of the motor is capable of considerably more than 400 HP at the crank but I hate to spend money if I dont have to. The 400 CI Bowtie short block is built strong and topped with AFR 210s and a solid roller 234/244 550 lift camshaft.
My 350 currently has a long runner setup on it but I plan to top the 400 with a stealth ram and a 58mm TB when I install it.
I am sure it would love to have 1 3/4 long tubes and a 4" catback on it but that is gonna be another grand or so to put together.
I also am not excited about the problems associated with long tubes and the Hooker setup is basically brand new. I do have a random tech cat. on it. Options??? Current setup OK for now??? Hp losses with it???
Thanks,
Roy

Air_Adam

It will work just fine with your motor, you just won't be making the most possible power from it. It should work for you just fine though.

unknown_host

iTrader: (1)

With your setup you should probably be looking at a dual 3" setup.

1989GTATransAm

iTrader: (3)

Here is a chart I have copied from one of the muffler companies. What is between the Hooker headers and the cat-back? Anyways going by the chart your 400 would be best served by a 3 1/2" cat back. Alex here locally is going with the Mufflex 4" catback with his 400 bombshell.

jbenge

iTrader: (2)

A couple of years ago I was running low 12's with my 383, my combo has changed(cam swap and head porting) since then but its similar to whats in my signature. I was using Hedman LT's, custom bent 2 1/2 ypipe, 3in flowmaster catback. I would run .2-.3 sec faster with open headers vs. through the 3in exhaust. Once I went with the dual 3in exhaust I haven't seen any difference in performance through the exhaust vs. open headers. I would guess at your power level you might lose 20-40HP with your headers and cat back. Your current setup is fine but won't make the most power possible.

unknown_host

iTrader: (1)

With AFR 210's, a solid roller camshaft and big displacement, he should be between the bottom two boxes on the chart. I would say dual 3" all the way.

That chart comes up on this forum all the time, I really don't like it. You cannot judge every engine by displacement alone. I have worked on 350ci motors that made 550 horsepower naturally aspirated turning 7500 rpm. Where is that on the chart ?