bull3t

Get the ROW M030 suspension. Gets rid of bounce and body roll without being too harsh. Not too expensive too.

5CHN3LL

No amount of new suspension parts - stock, RoW, or aftermarket - will address OP's original question of how to "increase torsional rigidity on a 996 cab..."

As TheMystro pointed out, the coupe is going to be stiffer than the Cab - and a C4 coupe with the additional bracing for the FWD stuff is going to be the stiffest 996 you can get short of a GT3 or a car that's had a welded tubular cage installed.

OP, perhaps this is a reason to buy a second 996, so you have a rock-solid coupe AND a cab...

bull3t

get the row m030 it'll do you some good

mrjonger

I was able to hang around the shop last time my mechanic did maintenance. I'm not sure about the hard top, but he indicated that it's good practice to have the top closed when putting the car on the lift as it does add rigidity to the chassis.

I'm not sure where you're at, but you can catch a ride in mine sometime if you around the LA/Long Beach (CA) area. My cab only has 20K miles and mechanic tells me it's a really tight chassis. I wouldn't know, it's my first Porsche and first cab...feels pretty flexy and creaky to me haha. Maybe it'll give you and idea of what it should feel like and see if that's good enough.

The Dad

There are always compromises. ;-)

alpine003

x2

The only things I can think of to reinforce the chassis but not guaranteeing if it will actually help in a Cab would be the Elephant Racing X bar for the front and Brey and Krausse Harness bar to tie in the upper seatbelt mounting points for increased lateral stiffness. If you go over the top with the top tier version, you maybe able to dial out some torsional flex as well. Obviously with any of these items, you will lose some usability in that space.

The Dad

Interesting. I've already pulled the back seats, because they're effectively useless - and without them in place, a smallish dog can be comfortable under the windblocker.