What is the benefit of High Flow Mids over stock mids? I know that they will be louder which I like but is there any other reason to get them?

Thanks
Damon

 

What Mods to you currently have ???
It's one of those "it's 1 piece of the big puzzle Mod's"
On a Race truck looking to squeeze ever ounch of ET the full meal exhaust system becomes a big part, you got to get more out of the motor if you plan on utilizing putting more into it. BUT on a lightly modded truck the results prob cant be measured and as you said it just becomes a sound system.

 

That being said, the stock mids are the restriction in our exhaust.

 

Mods are as follows:
Ported blower, ported heads, 2lb upper, 4lb lower, sbtb, cai, tune, cat back

Not really looking for extra power from the high flow mids but anything gained it always a plus. I just wanted to know if there is anything to be gained other then the nice sound she will be making.

 

You should free up some back pressure with them. Are you on the stock bottom end? Cams?

 

Still on stock bottom end and no cams as of now.

 

high flow mids are the way to go.

I agree that they are the restriction of the exhaust.

Couple local guys put out some good numbers on just high flow cats.

 

well the mids should be here this week and maybe on the truck by monday.

 

Stock exhaust and cats: 10 psi back pressure at full throttle!
Full Bassani set-up w/Bassani: 5 psi
Full Kooks set-up with Manaflow cats: 3 psi
I have not measured my catless Bassani mid pipe on my otherwise bone stock set-up, but sure it will be 3 - 1 psi.

All the backpressure is in the cats, that's why catbacks do not add any power, more than 1 psi back pressure is considered restrictive, particularly with a N/A motor. The performance disadvantage is less dramatic with SC motors, but still there.

 

I always thought that replacing the mids wasn't necessary on lightly modded trucks and that you could lose some tq. I really really want to wake up the L sound wise w/ a set of highflow mids, but am afraid to lose tq. Right now I'm making 409hp/476tq w/ my current mods, I will be switching to a 6lb lower because I don't think I'm taking full advantage of the ported blower and will most likely get a BA2400 for x-mas. Do you guys think I could benefit from high flow mids?

 

When Sal was last out in Norcal, he told me that at 15 psi boost and cats in place, the best I could hope for would be 10 psi.

Now keep in mind that I have my pipes out the back, one on each side. With CA legal Cats and a pair of Bassani's I was able to get it down to that number but at the expense of it being way too loud for my taste.

I reinstalled a pair of 3" bore, 54" long All Stainless Steel packs and now at 15 psi boost it is below 10 psi at 6250 rpm (my shift point). I now have the best of both worlds in that I have reasonable back pressure and a noise level that is less than that of a stock Lightning.

 

The backpressure values i provided were measured on several trucks with 13-15 psi boost with the complete exhaust systems described. The 3 psi value was on a Kooks/JDM setup with the 4 x 9 ovals which provide aone of the quieter, deep mellow sounds. You do not have to seetle for high back pressure to kep it relatively quiet. If you are measuring back pressure that high with high flow cats your cats may be plugged.

 

If your a numbers guy a full exhaust on a bolt on modded L is worth 15-20 HP and around 30 FPT, don't expect to set the world on fire with this mod, Rob is 100% correct it's a piece in the performance puzzle or a step on your way to reaching a performance goal, with all the bolt ons a stock Eaton and a 4lb lower I made 444 HP on JDM's dyno. I would think the stock 4 cat setup is biggest bottle neck but theres a few HP to be had in swapping the cat back and I know long tubes will definatly increase torque, if you got 10HP and the same amount of torque increase I'd be happy.

 

I think its a "needed" addition if your going with the 6lb lower.

I think Im going to do the same thing, - replace the 4 stockers with 2 hi-flow cats along with a MAF upgrade and a 6lb lower.