KYOSTAR Heat Exchanger Upgrade — BMW G-Series B48/B58 (M340i/M440i/330i)
Heat is the enemy of boost. The B58 runs a water-to-air charge cooling circuit, and the factory heat exchanger is the bottleneck — intake temps climb, timing pulls, power fades on back-to-back pulls. KYOSTAR's upgraded heat exchanger (NA-HE-1005-SM-BK) fixes the weak link with a larger, more efficient aluminum core built specifically for the B58 Gen2.
All-aluminum construction for durability and heat dissipation, engineered as a direct-fit upgrade for BMW G-series cars running the B48/B58. 1-year warranty from KYOSTAR (Guangzhou Kosda) — a 12-year manufacturer, TUV Rheinland verified, with over $730K in online revenue and a 30% reorder rate. OE reference 101401000Q.
Fitment: BMW G-Series with B48/B58 engines — M340i, M440i, 330i and related G-chassis models. Confirm your year, model, engine (B48 vs B58) and VIN with the seller before ordering.
Safety: Professional installation recommended. The cooling system must be properly bled of air after install — trapped air causes overheating. Allow the engine to cool fully before working on the cooling circuit.
Factory-direct from China: Made in China and sourced straight from the vetted factory — no middleman markup. Ships from our factory partner with tracking provided. Delivery times vary by destination.
Aftermarket part — not a genuine OEM product, and not sponsored or endorsed by the vehicle manufacturer. Fitment is verified on every order before it ships.
Ships from our factory partner with tracking provided. Delivery times vary by destination.
Heat is the enemy of boost. The B58 runs a water-to-air charge cooling circuit, and the factory heat exchanger is the bottleneck — intake temps climb, timing pulls, power fades on back-to-back pulls. KYOSTAR's upgraded heat exchanger (NA-HE-1005-SM-BK) fixes the weak link with a larger, more efficient aluminum core built specifically for the B58 Gen2.
All-aluminum construction for durability and heat dissipation, engineered as a direct-fit upgrade for BMW G-series cars running the B48/B58. 1-year warranty from KYOSTAR (Guangzhou Kosda) — a 12-year manufacturer, TUV Rheinland verified, with over $730K in online revenue and a 30% reorder rate. OE reference 101401000Q.
Fitment: BMW G-Series with B48/B58 engines — M340i, M440i, 330i and related G-chassis models. Confirm your year, model, engine (B48 vs B58) and VIN with the seller before ordering.
Safety: Professional installation recommended. The cooling system must be properly bled of air after install — trapped air causes overheating. Allow the engine to cool fully before working on the cooling circuit.
Factory-direct from China: Made in China and sourced straight from the vetted factory — no middleman markup. Ships from our factory partner with tracking provided. Delivery times vary by destination.
Does this fit my car?
Enter your vehicle details below. We'll confirm exact fitment with your year, trim and VIN before you order — never guess, never assume.
Shipping: Ships from our factory partner with tracking provided. Delivery times vary by destination. Import duties for your country may apply at delivery.
Why StealthTorque
Same factories the industry buys from. None of the middleman markup.
| Compare | StealthTorque | Typical US retailer | Marketplace sellers |
|---|---|---|---|
| Pricing | Factory-direct. No middleman markup. | Marked up through distributors and retail overhead. | No pricing standard. Varies wildly. |
| Manufacturer vetting | Every factory reviewed before a part earns a listing. | Varies by brand. | No vetting. Anyone can list. |
| Fitment verification | Free VIN check before dispatch. | Fitment charts. Rarely VIN-verified. | You're on your own. |
| Buyer reviews | Real reviews from the manufacturer's listing. | Store reviews only. | Often missing or unreliable. |
| Shipping | Tracked, factory-direct. | Domestic warehouses. | Often untracked. |
| Support | Direct help from people who know the parts. | Ticket queues. | None. |