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yes it does.

Toyota GT-ONE Race Car: Stage 4 Turbo (1160HP). You will NOT find a car out there as fast as this one without slipstream. Seriously, this thing is FASTER than an X1 with minimal downforce.
Nissan Fairlady Z 300ZX: Stage 5 Turbo (1030HP). Around a 285mph top speed. Incredible.
Mitsubishi Lancer Evo IV GSR '96: Stage 5 Turbo (550HP). Slow and sluggish. Don't bother with this one.
Both premium Mazda Eunos Roadsters: Stage 5 Turbo (340HP). Sounds like nothing, but remember that this is a Miata we're talking about here. Combined with the unique quirkiness and ultra-light weight, these things HAUL ASS. And the turbo? Loud as heck.
Mitsubishi FTO Super Touring Car: Stage 4 Turbo (630HP). A crazy mo'fo to drive and makes mince meat of even LMPs. Gran Turismo 1's mental FTO LM Edition is BACK BABY! Runs a smooth 6:14 on Nordschleife on RS tires.
Mazda RX-7 LM Race Car: Stage 4 Turbo (750HP). Mental as hell to drive but can achieve crazy speeds and takes no time to get there.
Chapparal 2J Race Car '70: Stage 4 Turbo (1050HP). It's a 2J. It was fast before. It's even faster now! Problem is, it's got 3 gears, so properly gearing it for not only a great top speed but also decent acceleration can prove to be quite tricky.
Toyota 7 Race Car '70: Stage 4 Turbo (1120HP). Pointless. Don't even bother. Even with this much power it still fails to go over 250MPH.
Suzuki Escudo Dirt Trial Car '98: Stage 4 Turbo (1090HP). Still slow thanks to it's absurd downforce. Thanks PD for ruining such a fun car.

if you have garage editor 131 there is a 97 standard honda EK...yes standard 97..all parts work including brakes, if you tune like i do this car is a beast on a stright and track, try it if you run hondas...i fully tune all my cars tranny and suspension believe me if you dont tune you will never get the true power of your car...i've beating so called hacked cars with a simple tune because all people do is slap on parts....

thank you guys for helping out great long reply lol

It's because Stage 5 Turbo is like this massive beast turbo that kicks in at really high RPMs, I think around 10k?

Impreza Super Touring Car; stage 4 Turbo; 642 BHP
Cusco Subaru Advan Impreza '03; stage 4 Turbo; 587 BHP
Alfa Touring Car will also accept stage 4 Turbo.
i'm almost certain that all standard touring cars will accept stage 4 Turbo.

these cars have all stage 4 turbo and the engine is fully broken in;

-alfa 155 2.5 V6 TI '93; 615 bhp
-amemiya RX7 '04; 764 bhp
-audi A4 TC; 905 bhp
-audi TT TC; 820 bhp
-ARTA garaiyra '03; 478 bhp
-bmw M3 GTR race car; 834 bhp
-bmw M3 TC; 509 bhp
-chaparral 2D; 1030 bhp
-HKS silvia RS2; 590 bhp
-HPA R32; 612 bhp (+ catalytic converter racing) (weight reduction 5; 1245 kg)
-honda integra TC; 528 bhp
-honda S2000 race car; 561 bhp
-lexus IS 200 race car; 577 bhp (+ triple plate & flywheel racing) (weight reduction 5; 909 kg)
-mazda RX7 race car; 842 bhp
-mazda6 TC; 552 bhp
-mercedes CLK TC; 901 bhp
-mercedes 190 E TC; 589 bhp
-mitsubishi FTO TC; 654 bhp
-nissan C-WEST silvia; 581 bhp
-nissan FALKEN race car; 768 bhp (weight reduction 5;1196 kg)
-nissan GTR pace car; 998 bhp (+ catalytic converter racing & triple plate & flywheel racing) (weight reduction 5;1144 kg)
-opel astra TC; 871 bhp
-opel calibra TC; 653 bhp
-subaru impreza STC; 642 bhp
-subaru ADVAN impreza '03; 587 bhp
-toyota altezza TC; 549 bhp
-toyota WEDSSPORT celica; 621 bhp
-vauxhall astra STC; 871 bhp
-vauxhall calibra STC; 646 bhp

Mercedes SL65 AMG you can equip a Stage 4 Turbo on and it can get over 1,000hp.

Can somebody have stage 4 for Peugeot 908 HDI FAP ?