How much more HP with Magnaflow??
Senior Member
Joined: Dec 2005
Posts: 344
Likes: 0
From: North Metro Atlanta
Originally Posted by Tim Skelton
03BadAzz, you are apparently not following my previously posted suggestions for you:
"1. Read.
2. Critically evaluate the source. Lots of pure idiots roaming these boards.
3. Read more.
4. Ask.
5. Do."
As a matter of fact, the fact that you did not understand that the 380HP was at the flywheel suggests that you have not even mastered step 1.
Why bother answering these questions, guys? They do not even rise to the level of Lightning 101.
"1. Read.
2. Critically evaluate the source. Lots of pure idiots roaming these boards.
3. Read more.
4. Ask.
5. Do."
As a matter of fact, the fact that you did not understand that the 380HP was at the flywheel suggests that you have not even mastered step 1.
Why bother answering these questions, guys? They do not even rise to the level of Lightning 101.
1. The person is new
2. Everyone is here to help (or so I thought)
3. I would rather ask the question and get it answered directly rather than thumb through a few hundred threads with keywords trying to find my answer.
4. Apparently some of us are not arrogant as arrogant as others to say...go read, then ask
Senior Member
Joined: Jun 2003
Posts: 394
Likes: 0
From: Philadelphia, PA
Originally Posted by Allcarfan
Because:
1. The person is new
2. Everyone is here to help (or so I thought)
3. I would rather ask the question and get it answered directly rather than thumb through a few hundred threads with keywords trying to find my answer.
4. Apparently some of us are not arrogant as arrogant as others to say...go read, then ask
1. The person is new
2. Everyone is here to help (or so I thought)
3. I would rather ask the question and get it answered directly rather than thumb through a few hundred threads with keywords trying to find my answer.
4. Apparently some of us are not arrogant as arrogant as others to say...go read, then ask
Senior Member
Joined: Jan 2003
Posts: 5,097
Likes: 0
From: DETROIT, (formerly Eaton County, Michigan)
Originally Posted by Mondo1
Not true. If your muffler is restrictive as well as your intake, and you reduce the restriction, you will increase power. Not a great deal, but an increase none the less. If you squeeze the ends of your tail pipes until they are barely open with a full exhaust system upgrade, your truck will barely run. Yes, mufflers in general can be the "cork" in any vehicle. personally I have to say that the cat-backs in general are not the best hp per dollar values out there, they are more of a sound and bling mod more than anything else. BTW, I picked up 8 rwhp with the maggy cat-back and modified stock air box with a panel K&N. Not huge , but an increase. The way that the owner of Kooks headers put it to me was: In order to optimize any exhaust system, is not to go with big headers, but with a small (port size) primary tube header and have it get bigger as it works its way to the tail pipe. As he discribed , like a trumpet. Makes complete sense to me.
Ahhh Boy, where to start. I'll keep this one simple.
The Stock cat back system on the lightning will flow substantially more exhaust than the stock engine produces.
The only way you picked up power was that your air cleaner you replaced was complete garbage, and your muffler has squirrels living in it.
Senior Member
Joined: Mar 2001
Posts: 1,352
Likes: 0
From: CORAL SPRINGS, FL. USA
Thats actually pretty funny, menace, but please, first get the facts....and I stand by my findings, sir. I never said my motor was stock when I added the maggy.The only thing many of the members on this forum are guilty of, is getting the whip before the horse.(Or in this case, before the squirrel.) 
Either way, a good cat-back will eventually be needed. End of story.
Either way, a good cat-back will eventually be needed. End of story.
Last edited by Mondo1; Jan 31, 2006 at 10:18 PM.
Senior Member
Joined: Jan 2003
Posts: 5,097
Likes: 0
From: DETROIT, (formerly Eaton County, Michigan)
please show me proof (DYNO NUMBERS) that adding a K&N air filter and a magnaflow cat back exhaust will increase power over a stock system in good condition.
That simply is NOT the bottleneck of out air pumps. Since, our engines are basically a giant air pump. The restrictions come from the heads, Exhaust manifolds and catalytic convertors. The stock cat back is simply not an air bottleneck.
The stock catalytic convertors are the biggest bottleneck, all 4 of them. replace those and you'll see more air flow through our air pump under the hood.
That simply is NOT the bottleneck of out air pumps. Since, our engines are basically a giant air pump. The restrictions come from the heads, Exhaust manifolds and catalytic convertors. The stock cat back is simply not an air bottleneck.
The stock catalytic convertors are the biggest bottleneck, all 4 of them. replace those and you'll see more air flow through our air pump under the hood.
Senior Member
Joined: Mar 2001
Posts: 1,352
Likes: 0
From: CORAL SPRINGS, FL. USA
The stock catalytic convertors are the biggest bottleneck, all 4 of them. replace those and you'll see more air flow through our air pump under the hood.[/QUOTE]
I've always said that exact statement. More than 20 times to all those who posted that headers are the shiznit for these trucks. Your 100% correct, sir. The cats are where the "bottleneck" is at. Look at the bigger picture. Add a good modified intake airbox, highflow cat AND a freer flowing cat-back to a pullied and re-proramed ecu, and youv'e got yourself a runner.Take away the filter and the cat-back from that combo and you will see a drop in your numbers. Small... but a drop.The more mods,the bigger the difference. BTW, one of the last things I added to my Lightning was the cat-back and modded air box and I did pick up 8 H.P. on a dynojet in Miami and Dan03 was there to see it as well as 4 other L owners.
I've always said that exact statement. More than 20 times to all those who posted that headers are the shiznit for these trucks. Your 100% correct, sir. The cats are where the "bottleneck" is at. Look at the bigger picture. Add a good modified intake airbox, highflow cat AND a freer flowing cat-back to a pullied and re-proramed ecu, and youv'e got yourself a runner.Take away the filter and the cat-back from that combo and you will see a drop in your numbers. Small... but a drop.The more mods,the bigger the difference. BTW, one of the last things I added to my Lightning was the cat-back and modded air box and I did pick up 8 H.P. on a dynojet in Miami and Dan03 was there to see it as well as 4 other L owners.
Last edited by Mondo1; Jan 31, 2006 at 10:45 PM.
Senior Member
Joined: Apr 2001
Posts: 370
Likes: 0
From: Los Angeles California USA
Cat-Back
I still say that with most cat-backs you will probably lose a few horsepower. Most of the restriction on a stock lightning is in the filter box, not in the muffler. If you don't believe me, take the muffler off and it still will not be much different, if any.
On a supercharged engine, don't worry about the exhaust. (It is being forced out by that big pump on top of your engine)
If you like the sound of a cat-back, buy it for that reason, not to make more power.
Spend your money on the intake side (blower, pulley, filter kit, etc) and you will see much better results.
On a supercharged engine, don't worry about the exhaust. (It is being forced out by that big pump on top of your engine)
If you like the sound of a cat-back, buy it for that reason, not to make more power.
Spend your money on the intake side (blower, pulley, filter kit, etc) and you will see much better results.
Senior Member
Joined: May 2002
Posts: 4,928
Likes: 1
From: The People's Republic of Los Angeles
Originally Posted by Skip
. . . On a supercharged engine, don't worry about the exhaust. (It is being forced out by that big pump on top of your engine) . . .
The spent air is forced out the same way as on an NA engine - through the pumping action of the pistons. The boost is sealed off during the exhaust stroke (intake valve is closed).
Senior Member
Joined: Apr 2001
Posts: 370
Likes: 0
From: Los Angeles California USA
Exhaust
The blower is pushing the fresh air in at 8-20 lbs. The cylinders are getting filled even if they don,t want to be. Also the overlap tends to push fresh air and fuel out the exhaust.
Maybe what I should have said is that the stock exhaust flows enough for our motors, and probably better than most cat-backs.
One thing that we will all agree on is that most cat-back systems are way better looking and sound better than stock.
Maybe what I should have said is that the stock exhaust flows enough for our motors, and probably better than most cat-backs.
One thing that we will all agree on is that most cat-back systems are way better looking and sound better than stock.
Senior Member
Joined: Oct 2005
Posts: 178
Likes: 0
From: Havelock, NC
I didn't take the time to read everyone reply, so you may have already got this but...
Cat back = Kewl sound, no HP
The only increase in the way the stock SVTL motor breaths is a K&N, and high flow cats. Once you start getting over 500whp then you need to start thinking about long tube headers and start proting out the motor.
Hope this helps.
Lucas
Cat back = Kewl sound, no HP
The only increase in the way the stock SVTL motor breaths is a K&N, and high flow cats. Once you start getting over 500whp then you need to start thinking about long tube headers and start proting out the motor.
Hope this helps.
Lucas
Member
Joined: Oct 2005
Posts: 30
Likes: 0
From: Spur, Texas
HP increase
It may just be me but when i put on my Bassaini Cat back it seemed that the truck revved alittle quicker and shifter better than stock IDK though just what it felt like till i puked a plug at 120 lol 