Variable Restrictiveness Exhaust

[Gary Derian]

Adding backpressure just for the sake of it won't improve low speed torque.
Having small diameter ports which happen to add backpressure will.  Its not
the backpressure that improves torque.  Its the low rpm tuned components
that do.  Now, having a variable restrictor that quiets the car when
cruising is a good idea.  The new Nissan Maxima has such a muffler.
Mitsubishi 3000's have had them in the past.

Gary Derian <gderian at oh.verio.com>


> Ord Miller wrote:
>
> >I use high flow cats.  For the 1 or 2 HP difference, I really don't think
> >it's worth the risk of legal problems or injuring my environmental
> >consience. ;)
>
> >On the other hand, I am wondering if I could improve low rpm torque if I
> >could add a variable restrictor??
>