Originally Posted by jmartpr

What a coincidence...me too!!!!
Thanks for the Tune John....I got to keep away from you or I might end up with a 4.0L X51 kit!!!!

Originally Posted by Jmw1234

Dropped car off this am for install of sport headers w 200 cel. Cats ( Fabspeed) ipd plenum and larger throttle body

Topped it all off with a custom tune from FVD

Expect the car to NOW be a proper gt car as she can breathe properly and won't be constrained
​​

Originally Posted by Fabspeed John

That's a nice setup my friend! Enjoy the upgrades and thanks for the business

Originally Posted by Jmw1234

Thank you, John.

Car is tremendous with mods😁😁

Originally Posted by Alan C.

There are are some interesting upgrades coming out in the not too distant future for the GT4. Choices are good. Makes hanging onto the $60k delta for not trading to a GT3 more appealing.

Originally Posted by kfmcmahon

..do tell

Originally Posted by Jamie@dundonmotorsports

Quite a bit, everyone's favorite new track car is getting quite a bit of attention:

Things we're testing now on a Spyder Build we're doing.
991 GT3 Plenum and TB

Prototype Big Air filter box (less pressure drop)

X51 cams

X51 heads (they're a little different than stock GT4, and we're working on porting the stock heads to be better than X51)

Catted/non catted side pipes and high flow valved lower dB muffler (will work on any 981, and bolt to any race header)

The catted sides and muffler are going to select beta testers for feedback in the next few weeks, both local and extended Dundon family. The air box and 991 GT3 manifold adapters we're working on the tune on the Spyder and to ensure they are as efficacious as we expect.

On the engine side I spoke a bit at Smokies:
Phase 2 of the Spyder build is 4.5L bore and stroke. The fruit of this will allow us to easily make 4057cc (4.1L) engines with just a bore and big piston swap, 4167cc (4.2L) with stroker crank and new rods and 4.5L for the full meal deal. First parts are finishing design/mfg. These parts also apply to other 9A1's including the 991 GT3 and RS, but have to fix the valve train first...

Originally Posted by Alan C.

There are are some interesting upgrades coming out in the not too distant future for the GT4. Choices are good. Makes hanging onto the $60k delta for not trading to a GT3 more appealing.