997 GT2 Exhaust

The GT2, the pinnacle of the 997 range. the factory setup incorporates a titanium rear silencer section, so how could we improve on this? simply upgrading the material to formula one grade Inconel 625, the removal of the center chamber, addition of our trademark tight radius x pipe, and upgrading the catalyst section for 100cpsi HJS units, or decat sections for optimum performance.

The Sound

The Factory setup produces the most lackluster sound, mainly due to a series of chambers, restrictive catalysts, and the most prominent flaw being the lack of balance between opposing banks. Replacing the stock cats for either 100cpsi, or de-cat increases the sound respectively. Replacing the chambered transverse rear silencer with freeflow harmonically tuned silencers enriches the sound, and the addition of our trademark 1D CLR laminar flow X pipe raises the exhaust pitch beyond the region in which bass noise is able to penetrate the cabin, while under hard throttle and high revs, a rich and raucious vocal ensues. This design was pioneered and innovated by Kline Innovation.


Being a turbo car, the potential for increasing performance via exhaust and software is huge. The largest gains with our De-cat system are 42hp and 50lb/ft. In conjunction with software we achieve 75hp and 74lb/ft.

TÜV Certificate


Cross Section

De-cat cross section 70mm OD specifically chosen for a balance of peak torque and power.

Silencer section, cross section 63mm OD

Catalysts come in a variety, from 108mm OD to 127mm OD

manifold primaries, 41mm OD, chosen specifically for faster turbo spool


Turbo back system
Inconel 625 formula one grade material, weight 7.2kg (decat variant), 10.2kg (with 100 cell cats)
Titanium G2 silencer section is also available, weight 11.5kg

Inconel 625, weight, 2.9kg total
Titanium unable to endure extreme heat