icsmike

Any upgrades for these that don't crack and you can maybe buy the tubing your self?

BPG_Austin

Yep. Mark Robinson sells a nice silicon kit.

GlenL

The air intake tubes?

3" brake duct. haven't done it but it should squeeze in between the organ pipe intake and the fenders.

PorKen

Don't forget a side of TQrings for those tubes! (This simple mod makes a noticeable difference.)

I like the stock rubber intake hoses, myself. (They don't look as good, but they are easier to get a good seal with, I've found.) A new set of those will last a long time. (Especially, with the rings. Even longer with a crank vent bypass system.)

JHowell37

The Genuine Porsche brand boots/seals last a long time. The "generics" are much softer, not as oil resistant, and start cracking from oil/heat/ballooning/etc after a short time. I put a set of the generics on mine when I first got it running. Once I decided they were no longer good, I replaced them with a used set from an extra intake manifold. The genuine Porsche parts are much stiffer and sturdier.

Imo000

No need to over complicate things. Get some 2" radiator hose (NAPA sells them) and cut them to size. You can make them a littel longer so the clamps can't slide off the pipes (no need for "torque rings"). I've made a set for my boosted '85 years ago and they are still flawless.

PorKen

TQrings, as I call them, aren't for supporting the hose. They smooth the (weird) empty transition from plenum to runner, which makes a noticeable improvement in part throttle response and idle quality, likely by reducing turbulence just before the sharp bends on some of the runners. This is apparent even with a stock chipset. (I retuned the S300s chipset to take full advantage of them.)

Making the hoses longer will just make more turbulence by making a larger gap, and won't increase the clamped area. (You can't make them shorter because the center 'T' touches both plenums.)

It's difficult to cut hose of that size uniformly and the actual clamped area is quite small, so it's likely to not seal properly, unless it is professionally done. Cheap, slippery, silicone hoses (unlike Mark's) tend to squeeze out from the clamps.

Imo000

There is a lot of guesstimation in there Ken. Try the 2" rad hose on your car and report back if they leak or not.

Podguy

You are leaving a lot to the imagination. Can you add some detail on the various modifications??

Smokin' Joe

Any more details on the torque rings? This is the first I have heard of them.

MGW-Fla

Link:
http://www.liftbars.com/

Scroll down to this info on the TQrings with photos.

"TQrings - S3 intake enhancers

Fills the empty transition from plenum to runner. Increases air velocity and promotes more equal cylinder filling by reducing turbulence. Closer cyl to cyl AFR means less fuel per RPM for more part throttle power, better MPG, and lower emissions.

New S300s programming and map tuning makes for a virtually flat WOT AFR from 1000-6400 rpm, silky smooth idle, easier starting, and awesome performance from cold start to hot. Extremely low rpm running w/o stalling or complaint. Drives smoothly at 1000 rpm (or less). Pulls strongly in top gear at highway speeds.

Easily installed. Remove plenums, slide in rings, replace plenums.

click for larger click for larger

Included:
(8) Rings - machined aluminum"

Cost is $34 for the set.

soupcan

Mel, Congrats on the 968 you have always wanted.

Back on topic....Mark sells quality stuff and so does Ken.

MGW-Fla

Thanks Brian! Yeah, I've wanted a 968 cab for a dozen years, way before I even considered a 928. With there only being ten speed yellow cabs brought in to the States in 94-95, I couldn't pass this one up.

I like that garage in your avitar, I want one of those too!

Podguy

If the rings cure cancer I will take a set

BC

Guestimation? Did you read what he wrote? He just said he dyno tested these pieces. Transition for air movement is a science and it works. But just because most motorsports teams spends 1000s to millions on the science of how air flows, don't worry about it. They don't know what they're talk about.