Monthly Archives: December 2009

More exterior photos

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Here are some photos of the exterior of the car. JHM stage 4 clutch, lightweight flywheel, solid shifter linkage, Delrin shifter bushings, Stern control arms, and Stern motor mounts have all been installed. We had a clearance issue with the 18×10 TE37s and the rear parking brake spring; it would make contact with the wheel weights on the inner wheel. After moving the weights out 2mm, we didn’t have any more clearance issues. 18″ wheels with the Alcon brakes are a TIGHT fit.

Homemade B-pillars

CF mirrors

370mm 6 piston Alcons and 18×10 TE37s

Stern control arms and completed headers

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Today we put the transmission back into the car and buttoned everything back up. If everything works out tomorrow the brakes and cat-back should go on!

Below you can see the high-flow cats mate up to the new headers. JHM offers a pre-lengthened set of O2 sensors since the O2 bungs have been relocated on the longtube headers.

Some “better” photos of the JHM/Stern motor mounts.

Here the Stern control arms have been installed.

The S4 goes under the knife…

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Monday the S4 went under the knife to receive the first round of performance modifications. Take a look at the OEM exhaust manifolds. Proceed to cringe.

To gain access the exhaust manifolds we had to lower the motor. Pictured below, the transmission has already been removed.

The motor is supported so it can be lowered down enough to gain access to the exhaust manifolds.

Here you can see the JHM longtube headers installed.

This version of the headers uses v-band clamps.

We found a leaking slave cylinder, so we replaced it. While we had the motor down, we replaced the squishy OEM motor mounts with a set of JHM modified Stern mounts.

Time to bolt up the JHM stage 4 clutch and lightweight flywheel!

With the bell housing out, we can install the JHM solid shifter linkage and delrin shifter bushings.

JHM/Stern Motor Mounts

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Thanks to JHM for hooking me up with a set of their modified Stern motor mounts. B6/B7 S4 motor mounts are 110mm shorter than the aftermarket mounts that are currently available; these mounts have been modified so they will fit.


jhm-stern-motormount

GMG 2.5" RS4 exhaust with Labree mufflers

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The last piece of my exhaust puzzle was the cat-back exhaust; having previously run a 2.25″ APR downpipe and exhaust I needed something a little larger to mate up to the 2.5″ JHM longtube headers.

After poking around I found S-Fore, a local forum member, parting out his S4. He had originally purchased a GMG RS4 exhaust, but found that the internal drone was too much. To rectify this little problem he replaced the GMG mufflers with Labree mufflers and hasn’t looked back since. When I asked S-Fore to describe the sound, he said hands down it was the best sounding S4 exhaust. Ever.

Once the headers and exhaust are on I’ll see how the quad tips fill the RS4 bumper; if it doesn’t look right I’ll have weld on the OEM RS4 tips. If the exhaust isn’t loud enough, we’ll cut out the resonators!

The tips measure 3.0″ tall and 3.5″ wide.

exhaust2
exhaust

Ceramic coated longtube headers

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My JHM longtube headers have made it back from Performance Coatings! They’ve recieved a satin black ceramic coating to dramatically reduce radient heat.

We’re looking at a 110-120 degree temperature reduction in the engine bay; this should be good for a 11-12% increase in engine efficiency. Gotta love free horsepower!

For a 450-500HP motor we can expect a gain of 50-55HP. Show me a better mod for the money!

Thanks to Performance Coatings and JHM!

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lt-2