Why are you confused about the 6. gear ? Porsche changed the gear ratio on the 6. gear to improve performance and to be sure that the X50 cars don't run too fast. The top speed difference between a regular 996 Turbo and a X50 Turbo is only 2 kph. Guess why ?!
The one mass flywheel is VERY noisy, don't do it if you still want to be able to take your girl friend/wife with you, if you use your car as a daily driver or if you have a quiet neighbourhood.
I'm serious about that, there is a lot of noise.
I know cjv's story and I discussed it with two well known Tuners. Both doubt the output of 650 HP. I know that cjv has done a lot of dyno testing, etc. etc. but the doubts are understandable. To give you an example: to obtain 626 HP, RS-Tuning, one of the most appreciated Porsche tuners in Europe and especially in Germany, needs to install new camshafts too, to do some work on the cylindre heads and to install a new butterfly valve (I hope this is the right english name for "Drosselklappe"). They also need to do several test runs to adapt the software and the turbo chargers, so they need the car on the spot. Maximum output with all the knowledge and technique RS-Tuning has: 626 HP.
Streetlegal in Germany, passing all new emission laws over there. I don't know about cjv's car, don't know if the 650 HP claim is with 100 octane (US) fuel and I don't know if his car passes all emissions tests. But I've been also told by several Tuners that they don't like "switchable" power upgrades because this could harm the engine under extreme operating conditions. BTW: you might want to know how much RS-Tuning charges for a 626 HP power upgrade in Germany: we're talking about something around 40000 USD (yes, fourtythousand). Any more questions ?
To make it short: don't believe everything you read or you hear unless you saw and experienced it PERSONALLY.
Before getting into the 996 Turbo tuning stuff, I heard so many stories from people about this and that and fabulous power upgrades. It isn't difficult to gain 700 HP out of the 996 Turbo engine but how long will it last and how much fun will it be to drive ?
The steel synchron rings make sense for track racing but a gearbox oil cooler is the better choice for tuned cars, especially for street driving.
Why it isn't safe to track race a tuned Turbo ? Well, if you want to keep your car longer and enjoy it, you should stay below that figure. RS-Tuning for example asks customers if they want to use the car for the street or for the track to adapt the power/torque curve.
For track racing, the best solution is a mild motronic upgrade (up to 1.0 bar boost), a sport exhaust with high flow catalysts and a sport airfilter. We're talking now about 480-490 HP. Adding a sport clutch with stronger pressure plate and a gearbox oil cooler might be a good idea too. Now reduce the weight of such a car and you have a very nice performer without compromising reliability too much. Last but not least, don't forget the factory warranty. A 996 Turbo engine costs a fortune and if I say a "fortune", I mean it. Ask your dealer and you'll be shocked. ANY mod can be tracked down, don't believe the BS Tuners tell you. You HAVE to be aware of it before modifying your car. Because as soon as your dealer finds out, you might be in trouble ... or not. It depends on your relationship with your dealer and if you have major problems with your car after the engine upgrade or not.
Don't trust people who tell you this is no problem. Most of them NEVER had to deal with Porsche or PCNA when it came to warranty repairs. And trust me: if your engine brakes down and you need a new one, PCNA will send somebody over to check.
The GT2 rims/tires look nice and I love how they look on the 996 Turbo because they actually have the original Turbo look but are wider. A kind of original tuning, I like that. The tradeoff depends on what you're doing with your Turbo. If you're drag racing, you might not like the GT2 wheels.
Regarding suspension mods on the 996 Turbo: H&R is the best way to go. Why ? Heinz Remmen, the owner of H&R (and RS-Tuning customer BTW
), owns two 996 Turbos and he always takes care that his R&D department does it's job right. Porsche uses H&R suspension kits on their race cars, why shouldn't WE do that ?
Duane, I know that the internet if full of people who share experiences and give advises, good or bad. I'm maybe one of these guys. But you should always try to experience yourself what you want to buy. Never be too impressed by technical figures before you didn't drive several tuned cars to have a comparison. I drove a tuned 996 Turbo a while ago and I was impressed, very impressed. Later I found out that I shouldn't have been impressed because this car wasn't that fast as I thought. Before you make a decision, try to evaluate all options. And never forget the best advise ever: what sound too good (cheap) to be true, can't be true.
Again: if you want "high quality" 600 HP, we're talking about big big money. The choice is yours.