BMW 330i Performance Parts

Why Does Your BMW 330i Need Performance and Reliability Upgrades?

Pain Point 1: The Plastic N52 Coolant Flange Cracks and Weeps

The E90 330i N52 has one of the most predictable failure points in the whole BMW catalog, the plastic thermo to block coolant outlet.
Years of heat cycles make that housing brittle until it splits along the seam and dribbles coolant behind the alternator bracket where you cannot see it.
By the time the low coolant light flickers, the plastic has usually warped out of shape, so a new factory plastic flange just sets the clock ticking again.

Pain Point 2: A Leaking Flange Destroys Coolant Temperature Control

A weeping flange does more than leave a puddle.
It lets air into the cooling loop, pockets behind the thermostat, and turns a stable running temperature into a needle that swings every time you load the engine.
That thermal instability is what quietly bakes the head gasket and warps the deck on a high mileage N52, turning a cheap fix into a full top end job.

Pain Point 3: Diesel EGR Soot Coking on the M57 and N57

On the diesel 330d, 325d and 525d the EGR system recycles sooty exhaust back through the intake, and over tens of thousands of miles that soot bakes into a hard carbon crust.
The valve sticks, the intake manifold chokes, and the engine runs dirty, smoky and lazy.
That is the failure the M47, M57 and N57 EGR delete kits in this collection are built to address.

What Can a BMW 330i Upgrade Solve?

The Metal Coolant Flange Ends the Leak for Good

Swapping the failure prone OE plastic thermo to block housing for our CNC machined 6061-T6 billet aluminum flange gives the N52 a permanent, warp free sealing surface.
The high-temperature Viton O-rings hold system pressure, the hard anodized body shrugs off coolant chemistry, and you stop adding coolant every week.
It is the single highest value reliability upgrade you can make to a 2006 to 2013 E90 330i.

The Diesel EGR Delete Stops the Soot Cycle

For the diesel M47, M57 and N57 cars, the billet aluminum EGR block off plates shut the recirculation loop so clean air, not sooty exhaust, feeds the intake.
The result is a cleaner intake tract, steadier idle, and less carbon buildup over the life of the engine.

Shop BMW 330i Performance Parts by BMW Engine & Fitment Guide

• Metal Coolant Outlet Flange, Thermo to Block - Fits the N52 inline six in the E90 330i, E82 128i and E90 328i (2006-2013). Replaces the failure prone OE plastic housing with solid 6061-T6 billet aluminum and Viton seals.
• Metal Coolant Hose Flange, Thermo to Block - Fits the N20, N52, N53, N54 and N55 across the F30 320i and 328i, E90 335i, and E82 135i (2007-2016). Permanent fix for the leaking thermo to block coolant joint.
• Coolant Water Hose Fitting (OE 11537541992, 11537544638) - Fits the N20, N52, N53, N54 and N55 in the 330i, 328i, 335i and 128i (2007-2016). Direct fit replacement for the cracked factory plastic coolant fitting.
• EGR Delete and Cooler Valve Kit - Fits the diesel N57 and N57S in the 330d, 325d, 525d and 730d (2008-2015). Note: this is a diesel engine part and does not fit the gasoline 330i.
• EGR Valve Delete and Repair Tool Kit - Fits the diesel M47N2 and M57N2 in the E60 and E61 320d, 330d, 525d, 530d and 535d (2004-2010). Diesel engine EGR service only, not for the gasoline 330i.
• EGR Blanking Delete Kit - Fits the diesel M47 and M57 in the E46 and E60 318d, 320d, 330d, 525d and 530d (1998-2010). Diesel EGR blanking plate, not for the gasoline 330i.

Why Choose EGR Performance?

The industry standard for high-performance diesel reliability.

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What performance parts are available for a BMW 330i?

This collection centers on the hardware that actually keeps a BMW 3 Series on the road, starting with CNC machined 6061-T6 billet aluminum coolant flange upgrades for the N52, N20, N54 and N55.
The 330i specific parts are the thermo to block coolant flanges that fit the E90 330i N52 and replace the failure prone factory plastic housings.
The lineup also carries billet aluminum EGR delete plates for the diesel M47, M57 and N57 engines used in the 330d, 325d and 525d.
We do not currently stock a cold air intake, exhaust, or headers line for the 330i here, so we keep owners honest about exactly what fits.

Which BMW 330i generations and engines do these parts fit?

The coolant flanges cover the N52, which powered the E90 330i from 2006 through 2013, plus the N20 in the F30 320i and 328i and the N54 and N55 turbos in the 335i and 135i.
The early E46 330i ran the M54, whose cooling layout is different, so there is no matching flange in this collection for a 2001 to 2006 M54 car.
The newer F30 330i with the B48 and the G20 330i also use a different cooling architecture and are not covered by these flanges.
The EGR kits are diesel only and fit the M47 and N57 engines, not any gasoline 330i.

Do you carry a cold air intake for the BMW 330i?

Not in this collection.
We do not currently stock a cold air intake or induction kit for the E46, E90, F30 or G20 330i, so we will not sell you one that does not exist.
What we do carry for the 330i is the N52 cooling hardware, which protects the engine the intake would be breathing through.
If a cold air intake is the priority, confirm availability before ordering and we will tell you straight whether it is in stock.

Is there a performance exhaust, cat back, or headers for the BMW 330i?

No, this collection does not carry a cat back exhaust, muffler, headers, or exhaust tips for the 330i.
We focus on the cooling and EGR components we actually have on the shelf rather than listing bolt on exhaust hardware we cannot ship.
The rear diffuser and M Performance exhaust pieces from the keyword searches are not part of this lineup.
Tell us your exact chassis and we will confirm what, if anything, fits.

What about a performance chip, induction kit, or stage tune for the BMW 330i?

We do not sell a handheld tuner, performance chip, or stage tune for the 330i in this collection.
The 330i stage 2 and stage 3 builds in the search results need tuning software and bolt ons that are outside what we carry here.
Our 330i catalog is hardware that makes the engine reliable, not calibration that changes its output.
For a tune, source dedicated BMW tuning software matched to your ECU.

Why do E90 330i owners upgrade the N52 coolant flange?

The factory thermo to block coolant outlet on the N52 is plastic, and it is one of the most common reasons an E90 330i loses coolant.
After years of heat cycling it cracks and warps, weeping antifreeze down the block and letting air pocket behind the thermostat.
Our CNC machined 6061-T6 billet aluminum flange replaces OE 11537541992 and 11537544638 with a warp free sealing surface and high-temperature Viton O-rings.
It ends the recurring leak and protects the head gasket from the slow overheat that a leaking plastic flange causes.

Does the coolant flange fit the N20, N54, and N55 engines too?

Yes.
The metal thermo to block flanges in this collection are listed across the N20, N26, N52, N53, N54 and N55 families, so they cover the F30 320i and 328i, the E90 335i and E82 135i, and the 128i.
The N20, N54 and N55 turbos all share the same style plastic failure point, so the billet aluminum upgrade applies.
Always match the OE part number on your car, 11537541992 or 11537544638, before ordering, as the B48 in the newer F30 and G20 330i uses a different housing and is not covered.

Are the EGR delete kits for the gasoline 330i?

No, and this is the one to get right before you order.
The three EGR kits in this collection are for diesel BMW engines, the N57 in the 330d, 325d and 730d, and the M47 and M57 in the older 320d, 330d and 5 Series diesels.
A gasoline 330i does not have a diesel EGR system, so those kits will not fit your car.
If you drive a 330i, the parts that actually apply to you are the N52 coolant flanges.

Are BMW 330i parts street legal, and what is the warranty and return policy?

The N52, N20, N54 and N55 metal coolant flanges and coolant fittings are 50-state street-legal repair parts that remove or bypass no emissions device; they simply replace a failed factory cooling component.
The diesel M47, M57 and N57 EGR delete kits are emissions deletes intended for competition and closed-course off-road use only, and your local jurisdiction may restrict removing emissions equipment on a registered street car, so confirm fitment and your local rules before ordering.
Every order includes free shipping, is backed by a 1-year warranty, and comes with our 45-day return policy.

How do I confirm the right part for my BMW 330i before ordering?

Match your engine code and the OE part number first, because BMW changed the cooling layout across the M54, N52, N20 and B48 generations.
For the coolant flange, confirm OE 11537541992 or 11537544638 against your E90 330i N52, and remember the EGR kits are diesel only.
Our 24/7 live support can verify fitment from your VIN or chassis code before you buy.
Every order ships free, carries a 1-year warranty, and is protected by our 45-day return policy.