What about them? I think CTS Chris is right on the money with whats going on with the X pipes- better flowing exhausts (lower post turbine exhaust pressure) gives a larger pressure differential across the wastegate valve and lets them flow a little more so the boost comes down. The Xs sound really good but they're kinda like a musical instrument when you think about how many bends and turns they have in a relatively short run of pipe, I think mine was 360 degrees per bank in just a few feet of pipe, I may as well bolted a french horn on to the test pipes

 

Engine: 4.05L turbo Mezger (Built and tuned by Chris Cervelli)
PM 991Cup dual oiled crankshaft (53mm rod journal)
PM RSR oil pump
PM RSR IMS
PM 997.2Cup chain tensioners
PM 996Cup distick
PM 996Cup crankshaft pulley
PM 997Cup idler pulley
PM 997Cup serpentine belt
PM 997Cup electric power steering pump
CTSR PS pump bracket
CTSR solid engine / gearbox mounts
CTSR water to oil auxiliary engine oil cooler
996GT3 oil pressure relief springs
Mahle Motorsport 4.05L liners/pistons (23mm wrist pin) 9.1:1
997GT3 cam driven vacuum pump
Carillo Pankle custom 23/53mm rods
Schrick Motorsport intake / exhaust camshafts with CTSR oiling mod
Todd McKenzie ported heads w/ 9000 rpm valve springs
Full variable intake Variocam
RUF high flow intake manifold
IPD 75mm plenum
2.75” hard plastic turbo intake pipes
Marston Aerospace 4.0” intercoolers
SS321 48mm I.D. ported headers
3.5” titanium straight pipe exhaust
Tial XR1000 water cooled turbos
TI Automotive BSK1001 fuel pump
Returnless 5.0bar -8AN fuel system
Bosch Motorsport fuel filter with pressure/temp sensor
IDC1300x fuel injectors
Bosch F08DDER race plugs
Radium triple XR fuel pressure dampers
Radium AOS
Motec dual N75 valves
Motec DHB fuel controller
Motec DLTC lambda monitoring
Motec PDM
Motec M150 ECU


1.1bar (16psi) on 91octane




1.35 bar (20psi) on 91 octane




1.45 bar (21psi) on 95 octane




For comparison, here is the same engine (with the slightly smaller XR980s) when run on the OEM ECU tuned by Sam by Design. With the OEM ECU, the variocam was NOT fully variable but rather only a 0/30º step.

1.3 bar (19psi) on 95 octane

 

1000hp to the wheels, very nice indeed.

 

Amazing numbers.

 

Not my car but came across this oldy on 6Speed

This car is a tiptronic and was converted to RWD

according to an online hp calculator using the trap speed
a stock tiptronic is about 400 hp (crank)

the 93 tune on this car puts out 437 hp and the 109 race gas tune was just a bit above 500 hp.

im going to get my TT dyno tested before i start modding it. these results are impressive, but im willing to bet that this tune is/was pretty spicy