Pure Turbos Pure800 vs Pure900
Pure Turbos has dominated the BMW aftermarket for over a decade. When B58 owners graduate past stock-turbo Stage 2, two names dominate every enthusiast wishlist: the ubiquitous Pure800 and the flagship Pure900 Cast Manifold Kit.
While the Pure800 revolutionized the market by machining larger compressor and turbine wheels into the factory-style cast housing, the Pure900 takes an aggressive leap forward by ditching factory exhaust restrictions entirely in favor of a bespoke, aerodynamically CFD-sculpted cast stainless manifold.
| Specification | Pure Turbos Pure800 | Pure Turbos Pure900 |
|---|---|---|
| Peak Power Rating | 600–700 WHP (Fuel dependent) | 750–920+ WHP (Built block / E85) |
| Exhaust Manifold Design | Machined OEM-style Twin-Scroll Housing | Custom High-Flow Cast Stainless Manifold |
| Full Boost Spool RPM | ~3,100 – 3,300 RPM (Near instant) | ~3,500 – 3,700 RPM (Minimal lag) |
| Pump 93 Octane Ceiling | ~520–550 WHP | ~600–640 WHP |
| Ethanol (E50-E85) Ceiling | ~670–710 WHP | ~880–930 WHP |
| 100-200 km/h Dragy Times | 5.0s – 5.8s | 3.8s – 4.6s |
| Internal Engine Requirement | Safe on 100% Stock Engine Block | Forged Rods/Pistons strongly recommended above 650 WHP |
| Price Point | ~$2,500 USD (Core exchange) | ~$4,200 USD (Includes Cast Manifold) |
1. Turbo Spool & City Street Drivability
If your BMW is a daily driver used for commuting, running errands, and carving mountain twisties, the Pure800 is practically unbeatable. Because it retains the smaller twin-scroll volume, it builds positive manifold pressure right off idle. Step on the gas at 2,500 RPM, and by 3,200 RPM you are slammed back into the seat with full boost.
The Pure900 sacrifices only about ~350 RPM of transient response. Thanks to high-efficiency point-milled compressor wheels and a ceramic dual-ball-bearing cartridge, the lag is remarkably tame for a 900 WHP capable turbo—vastly superior to traditional laggy top-mount setups that do not wake up until 4,500 RPM.
2. Exhaust Backpressure & Exhaust Gas Temps (EGT)
The factory B58 turbine housing chokes exhaust flow once you exceed ~680 WHP. Forcing 30+ PSI through the stock manifold creates intense backpressure (EMAP) and dangerous cylinder temperatures.
The Pure900's cast manifold eliminates this bottleneck. By lowering exhaust manifold backpressure by over 30%, it allows the engine to breathe freely in high RPM, reducing knock tendency and protecting exhaust valves from heat fatigue.
🏆 The Final Verdict: Which Pure Turbo Is For You?
Buy the Pure800 if: You have a stock engine block, want instant throttle response, daily drive your car, and your horsepower goal is a reliable 550 to 650 WHP on pump or mild ethanol blends.
Buy the Pure900 if: You are building a 750+ WHP monster, participate in 1/2-mile roll racing or 100-200 km/h Dragy competitions, plan to forge your engine block, and refuse to get gapped by tuned GT-Rs and twin-turbo Lambos.
Frequently Asked Questions
Can I run the Pure900 on a stock B58 engine block?
Yes, but boost must be torque-capped below 600 WTQ (especially on B58 Gen1). To extract all 900+ WHP from the Pure900, forged connecting rods and drop-in pistons are mandatory.
Does the Pure900 lag significantly more than the Pure800?
Due to Pure Turbos' high-flow cast manifold and optimized dual ceramic ball-bearing cartridge, the Pure900 hits full boost only ~300-400 RPM later than the Pure800 (spooling by ~3,600 RPM vs 3,200 RPM).
What fuel is required to hit 700+ WHP on a Pure800?
You will need at least E50 ethanol blend or Full E85 combined with an upgraded high-pressure fuel pump (Dorch Stage 2 or Spool FX-180).