I bet if the alignment got checked, it's not really in alignment anymore. I've had my alignment drift out of spec twice on the Supra. Always in the rear, and always toe.
A brief counterpoint on R888R:
I think they get too greasy for track use, but I love them for the street. Yes, they're a bit noisy, but I personally feel it's overblown.
You can run stock turbo and fuel system up to E50 without issue. All you need is a flex fuel kit that supports CAN bus integration, and a tune to match. There are several options on the market to this effect. You'll probably skim 500 with this setup, but expect something in the range of 475 so...
By "heat exchanger" do you mean the one at the front of the car, or the intake manifold?
If you mean the one at the front of the car, it's a waste of cash. You want a manifold for consistent IATs.
Dual 3" is roughly equal to 4.2" single. It's more than enough. For example, if you had a single 4" pipe and then connected a Y to that with a split to two individual 3" pipes, the flow would match all the way through.
On a Pure 800: +33 WHP, +27 WTQ with no changes to the map -- only change was 3.15" exit DP and 3.5" exhaust to 4" exit DP and 4" exhaust. I don't have the dyno sheet, but I have personal knowledge that this customer was then able to revise their map for more boost and ended up around +44...
It's not listed on their website. Good to know. Pretty poor salesmanship on their part, though, to be one of the few truly performant Supra exhausts and not say anything about it. But I'm just some dude, I suppose.
A full 4" exhaust, with a 4" downpipe (AT BOTH ENDS), and an exhaust that's truly 4" (or transitioning to dual 3") the whole way adds 15-20 WHP on the stock turbo and upwards of 40-50 WHP on an upgraded turbo.
People say exhaust don't add power on the Supra because pretty much everyone pisses...
SHS Autosport is not a real 4" exhaust. It hooks up to the OEM downpipe, which has a 3.15" exit. That means the total flow of the exhaust is limited to what can be moved through a 3.15" diameter. That makes it, in reality, a 3.15" exhaust.
The 4.0" number is pure marketing.
Literally any OBD reader. Oil pressure is a standard SAE value reported over CAN to OBD scanners. Though I admit I'm curious as to why you're looking at it, since I'm 99.999999% it's in-spec.