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series.trackday · 08-25-2021, 05:21 PM

I think there's two issues, here.

One is, did the shop do work you didn't authorize? Because if I agreed to a $10K build and they tried to deliver it two years later with a $40K bill I'd leave their shop and drive straight to a lawyer's office. In fact, I've never had a performance shop change an agreed-on price by more than a couple percentage points in overall price (IE, extra $200 on top of a $18K invoice) for any work I've had done.

Two is, is $40K for a 400 HP, 700 HP "possible" build*, reasonable? Well, anything's reasonable if you think it's reasonable. A 700 horsepower air-cooled Porsche build would be way, WAY more than $40K. OTOH a 700HP Mustang would be quite a bit less than that. The FA20 isn't a strong platform to build big power on, so - maybe? What's the cost of other 700HP FA20 builds? Personally I wouldn't aim for another over 300wHP if I wanted to stick with a FA20 engine.

* 700 HP possible build is, in this context, worthless nonsense words. If it's running 620HP on your "street" tune and 700HP on the "track" tune, that's a 700HP build. Non-running at 480HP "built for" 700 HP is worth nothing. You're looking at paying $40K for a 480wHP dyno queen.

08-25-2021, 05:21 PM	#36
series.trackday Member Join Date: Aug 2021 Drives: '17 Subaru BRZ series.Yellow Location: MD Posts: 86 Thanks: 15 Thanked 93 Times in 47 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I think there's two issues, here. One is, did the shop do work you didn't authorize? Because if I agreed to a $10K build and they tried to deliver it two years later with a $40K bill I'd leave their shop and drive straight to a lawyer's office. In fact, I've never had a performance shop change an agreed-on price by more than a couple percentage points in overall price (IE, extra $200 on top of a $18K invoice) for any work I've had done. Two is, is $40K for a 400 HP, 700 HP "possible" build, reasonable? Well, anything's reasonable if you think it's reasonable. A 700 horsepower air-cooled Porsche build would be way, WAY more than $40K. OTOH a 700HP Mustang would be quite a bit less than that. The FA20 isn't a strong platform to build big power on, so - maybe? What's the cost of other 700HP FA20 builds? Personally I wouldn't aim for another over 300wHP if I wanted to stick with a FA20 engine. 700 HP possible build is, in this context, worthless nonsense words. If it's running 620HP on your "street" tune and 700HP on the "track" tune, that's a 700HP build. Non-running at 480HP "built for" 700 HP is worth nothing. You're looking at paying $40K for a 480wHP dyno queen. Last edited by series.trackday; 08-25-2021 at 08:27 PM.