BP with stock Festy exhaust

[FeistyFesti]

The BP in my Festy is hooked up to the factory .5 inch exhaust down pipe all the way back to the muffler. On Sunday, I'm taking it to a muffler shop to get 2.25 inch pipes all the way from manifold to a Super Turbo muffler. Will this realistically add 10 to 12 horse power from its current set up? Would a glass pack muffler make even more power?

[bhazard]

Maybe, maybe not. 10-12 horses is optimistic. You might lose some low end punch but gain high rpm power.

[FestYboy]

use the turbo muffler, and add the glass pack as a resonator to help eleminate the drone that you'll now have from the 2.25 pipe.

[Basement_Modder]

Somebody should make a exhaust setup that has a valve that opens up fully when at WOT and closes a bit at low throttle. Full power, 24/7.

[timmay89]

I agree, add a resonator. I have a BP engine with 2.25" exhaust and it is too loud!

I find that there is more top end power, but the bottom end takes a couple seconds to really kick in. I think if I did it again I would install 2" exhaust because I like having instant acceleration.

[iceracerdude]

Thanks, I'm about to have one done for a bp setup I'm finishing up for a friend.

[bhazard]

Somebody should make a exhaust setup that has a valve that opens up fully when at WOT and closes a bit at low throttle. Full power, 24/7.

Hmm like a dynomax vt muffler?

[Rocketman]

Somebody should make a exhaust setup that has a valve that opens up fully when at WOT and closes a bit at low throttle. Full power, 24/7.

Like this?

[FestYboy]

hahaha nice use of an unwanted throttle body. i'd remove the TPS before installing it though.

[fastivaB6TG25MR]

Somebody should make a exhaust setup that has a valve that opens up fully when at WOT and closes a bit at low throttle. Full power, 24/7.

929's and a few other full size japanese cars have them stock

[sasquatch]

hahaha nice use of an unwanted throttle body. i'd remove the TPS before installing it though.

EGVR not TPS... :p

(exhaust gas velocity regulator)

[Safety Guy]

From what's posted here, I think I'd keep my standard 2" exhaust system for a BP, just as I have them for my B3 and B6s, with the following:

-Magnaflow low restriction cat

-Thrush glasspack as a midpipe resonator

-Magnaflow oval muffler

All 2" inlets/outlets.

The only difference is that Luxstiva doesn't have the glasspack under the floor, so she is quite noisy. On the other hand, AquaMutt has it and it seems to make a nice difference.

It just seems to me that the 2" system should be pretty good for most B series engines unless you're running a turbo or have a really built engine.

Also, if I were keeping a B3 in a car, I'd probably go down to a 1 3/4" pipe system, or something just under 2". Going midway between the little stock pipes (1 1/2", IIRC) and the 2" system should provide better low end torque, keep the cost down a bit and also lower the weight slightly. All good for the B3; probably good for a B6, too.

Just my semi-educated guess-timation!

Karl

[FeistyFesti]

Thanks SafetyGuy, I've been thinking about 2 inches the last two days because I didn't want to lose any low end torque. So I will more than likely do this tomorrow at the muffler shop. So glad we have a shop that is open on Sundays!

[Rocketman]

hahaha nice use of an unwanted throttle body. i'd remove the TPS before installing it though.

TPS has been on there for two years without issue...idk I guess it doesn't get too terribly hot back there. I welded an extra aluminum flange to the TB so I could make it fit the exhaust easily.

I think I will be installing a wastegate actuator on it to open it up under boost, for now it's cable actuated. I mostly keep it open though, the turbo spools much quicker & has much more top end, I'm guessing my 90° junction there is pretty restrictive

For an N/A BP - 2" is probably sufficient, you might be able to do 2.25" with cat/resonator/muffler

My 2¢
-Rocket