I am thinking of adding a set of Dynatech longtubes with 2 high flow cats and Magnaflow cat-back. My question is have any of you experienced this "loss of boost" I've been hearing about? My truck is a stock 03 Lightning and I plan on keeping that way with the exception of the exhaust. I DO NOT want to give up even a half pound of boost because I am very happy with the trucks power as is. I just want that bad *** sound. Is there any boost loss with this exhaust setup? Thanks!

 

I think there is a boost lost almost anytime you open the exhaust up. Doesn't mean you are losing power....maybe a little torque on the bottom end, but not much.

 

Wide Open,
I added the DynaTech Long tubes/high flow cats and the Maggy back pipe also. I noticed a "slight" drop in boost only because you open up the flow of exhaust. But you gain low end torgue.

The loss in boost is minimal to say the least and the gains you receive far outweigh the loss of boost in my opinion.

 

I put that same system on my truck; I didn't lose any boost. If I did it was 1/2 a pound at the most. I did pick up 2 tenths in the 1/8th by just adding the full exhaust system; that was in the same weather with no other changes.

 

loss of boost does not equal loss of power.

 

You won't be dissapointed with the setup as described. It is awesome. As was mentioned. boost loss has nothing to do with power in this case. 1/2 to 1 lb total loss in boost. Boost loss will always occur with a good set of long tube headers. Power will also be up.

 

Boost is basically just the measurement of pressure present in the intake tract. By adding LT's, you are getting rid of the exhaust more efficiently, thus reducing the amount of pressure(boost) present in the intake tract. The motor will make MORE power with LESS boost, simply because that particular mod enables the motor to function more efficiently. This is a GOOD thing.

Another illustration is, if you add a larger lower pulley, you're spinning the blower faster, thus forcing more air into the motor, which creates more pressure (boost). In this instance the motor makes more power due to the extra airflow entering the engine. You're not making the motor any more efficient, you're just stuffing more air into it.

I guess what I'm trying to say is....there is NOT always a direct correlation between boost and power production. As a general rule...anything you do to the intake side of the blower(Cold Air Intake, Larger Throttle Body, Porting of the blower itself) will help to INCREASE boost production. Anything you do after the S/C (Ported Heads, Long Tubes, etc..) will DECREASE boost pressure BUT make MORE POWER because it is allowing the air to exit the motor more efficiently. Hope this helps, as I'm no engineer.

Later,
Rob