dennisbernal91z

iTrader: (2)

Title really says it all.

My Z28 will be all street driven. But I plan on it making around 650-700 hp with a Procharged 390 pushing about 14 psi of boost.

Maybe a bit less if that makes it more streetable. The plan is to have something really easy to drive a lot of miles.

I want a simple exhaust that will tuck nicely since I plan to run air ride and want to lower the car as much as possible before the 2210s hit the ground when parked.

Would Hookers new true dual setup be enough flow? How to I calculate this? I have 64cc heads with a comp ratio of 9:1 in a 390CID engine. Knowing all this I can calculate how much air is pupped out at a certain RPM and psi. Great.

But then what is the next step? Assuming I can find data on the total length of the hooker setup. All I know is that it is a twin 2.5" setup that I would need to attach to my 2210s.

Any help here would be a great help. Thanks!

Orr89RocZ

iTrader: (20)

It will work. Dual 3" would be better but be harder to fit. But not much more difficult. But 2.5" with straight thru mufflers will make that power

midias

If you have trouble fitting it you might want to look into an aftermarket panhard bar. It will let you fit a dual 3" easier or 2.5 much easier

https://www.foundersperformance.com/...maro-firebird/

dennisbernal91z

iTrader: (2)

Thanks for the replies.

I know about the panhard components.

Really much more interested in not making another exhaust. That's why i am asking specifically about the hooker 2.5 inch setup.

If they sold a 3 i would go that route. But they don't.

Single 3.5" had 9.6 square inches
Dual 2.5" has 9.8 square inches.

Looks like it is the hooker dual setup.

I previously had a 4 inch mufflex w/ spintch muffler. Car was loud as hell. I hated it. Cool for 10 seconds. Looking to really get sound under control.

Orr89RocZ

iTrader: (20)

Dual will help the sound if you can get some mufflers in there
Bullets in the driveshaft tunnel area then when you go over the axle, run some straight thru thicker case mufflers like dynomax ultraflo round. Its not restrictive at all and quiets well. I did this on a dual 3" setup and was very quiet and still enough to support 1000 whp

skinny z

General rule: 2.2 CFM of exhaust flow per horsepower is needed before power is lost due to backpressure. At 700 HP, that requires about 1540 CFM. That's a combination of muffler and exhaust pipes.
Yes, there guys all over the place that run inefficient exhaust systems and they make this power or that power. My question to them is: what would you make with a properly spec'd system? I rarely get an answer.

EDIT: Holley doesn't give a spec/CFM on the mufflers used in their Black Heart system.
Their engineer has been on this site a few times. Perhaps a question to him will get you an answer. User name "toddoky".

midias

Generally straight through mufflers the more pipe you have after them the less noise they make. so remember that when planning the bullet mufflers. Also consider space if you wanted to add another.

dennisbernal91z

iTrader: (2)

Thanks skinny z. I will jump over to the thread that toddoky is replying on about the black heat true duals. Lets see if Hooker knows the CFM.

Chances are since I am going for fitment and then flow, not hunting down every last ounce of power I will just go with the 2.5" duals and run them "stock". Then add mufflers as needed once the car is running (a couple years from now...)