ratter

I guess it depends on what you call direct fit

yes but in theory it can be up to 360 degrees fitted incorrectly, flanges have a few degrees on movement

I would rather deal with flanges than V bands

air speed? so a 4" turbo side must be a backward move as well then?

why?

again they vary, but generally ok, the 3.5" has more room around it so it can get away with some error in factory bending

Except for the hole, Don's car is no different to any other car that we have fitted the exhaust to, we tweak all of them to improve the fit, but they can be fitted and do get fitted by many places with no tweaks, the tow bar on his car proved to be the biggest issue. we have had to do large bends on some Xforce systems to clear even on the twin 2.5" systems, we had to do even more major mods on a twin Manta 3" system to make it fit

I'd disagree there

that's good to hear, but the quality tends to vary quite a bit on Xforce systems

correct, torque management and the driver may disagree at times

data log it, that is the only way to see it is staying fully open at wot

some exhaust shops that quote cheap fitment prices will not chase fitment issues if any arise, check with them first, if they supply the system as well as fit it should be concern to chase it, if you supply they may make it your issue

we have fitted some Xforces with no mods, some have to be totally reshaped it seems

Stoich of any fuel is the cleanest burn, different emissions will increase while some will decrease by changing either richer or leaner than stoich, stoich is not about fuel useage

some Xforce exhaust we have fitted have required major mods to fit, part of Dons issue was the custom tow bar fitted to the car, the exhaust was heated and bent to provide better clearance when hot as well as cold

running leaner than stoich creates higher Nox, which is the major concern at present and why GM stopped the lean cruise

lean cruise mode of 17:1 was normal on some 90's cars, and pretty much non existent these days except for some direct injection engines, but having the rpm lower will lower co2 emissions and save some fuel

oil pump issues normally result in no oil pressure which will give a lot worse issues than you have described, flywheel/flexplate coming loose is a common issue

people have been using jet drills for years with great success for fine calibration, but knowing the machining facilities available to KPM, I dare think they are using a little more than a set of hardware drills and a black and decker

we have not seen a single milkshaked one through our shop, have seen one that leaked but lucky for the owner it was an external leak. I honestly believed the failure rate would be less than 2%, so I started a Poll on AFF, it is currently at 11.46% failure rate although I still think this is a bit high as with most things, those that have had issues are likely to speak up while many that have not will not say anything. We put a PWR unit on my wifes G6ET the week it was out of warranty, I will be purchasing a XR6T shortly and have already got a PWR cooler sitting under my desk to fit immediately.

Many people do not understand the venturi affect and proceed to modify to improve 1 area but destroy another

my dealer tells me there are 4 different ones and range from just under $200 to high $200 iirc

tuning will not get rid of noises

yes it will fall off dramatically, how much depends on many things, some will only hold 12 in the top

saw 18 on bels G6ET with zero duty cycle