Underdrive Pulley Questions

[Ghostrider 310]

Do more research Meir, there are many who have written that a Boxster needs a certain amount of back pressure. One would think less restriction is more power always but in this car it may not actually be true. You also may get jammed up at inspection time assuming Fla has such a money maker.

[Meir]

Originally Posted by Ghostrider 310

Do more research Meir, there are many who have written that a Boxster needs a certain amount of back pressure. One would think less restriction is more power always but in this car it may not actually be true. You also may get jammed up at inspection time assuming Fla has such a money maker.

That is exactly what I'm talking about. I know some back pressur is needed. that's why I'm surprised to read that some of you guys are running headers and test pipe without experiencing any loss of torque.
I defenetly plan to read as much as I can about the subject.
Just to give you the general idea, the muffler will be bypassed (partly) by valves.
The valves will be controlled by an on off switch and/ or by RPM, using a special module.
We kind of hijacked this tread, so when I'll start working on it, I'll start a new one.
I hope to receive a lot of opinions and ideas.
And no. No inspection In FL. you can ride a car with a jet engine if you want

[Ghostrider 310]

Just another reason to hate NY, it's a laugh taking your one year old truck in with 7 thousand on the clock whilst a technician pretends to make sure it's safe, state money grab NY is great at that kind of stuff.

My 986 still had the cats as that year they were placed downstream of the header pipe. What I'm saying is the addition of sport muffler & headers left the catylytic converters in place. Maybe they provided the back pressure that made the system retain the low end torque, can't say for sure. All I know is the headers, UP, sport exhaust and intake mods did improve the derriere dyno.