What is the main benefit of using +1mm oversize exhaust valves?

The +1mm oversize diameter allows for increased exhaust gas flow out of the combustion chamber. This improved flow can lead to better engine breathing and potentially higher performance, especially in modified or performance-oriented engines.

What material are these Brian Crower exhaust valves made from?

These valves are constructed from a high-strength, heat-resistant alloy. This material is chosen to withstand the high temperatures and pressures found in performance internal combustion engines.

Are these valves a direct replacement for stock exhaust valves?

While these valves are designed for specific Subaru EJ engines, they are a +1mm oversize modification. This means they are intended for engine rebuilds where the valve seats will be machined to accommodate the larger diameter, rather than a simple drop-in replacement for stock valves.

Brian Crower Exhaust Valves +1mm Over STD Tip (33mm) BC3605-

Name: Brian Crower 02-09 WRX / 04-09 STI EJ205/EJ255/EJ257 +1mm Over STD Tip (33mm) Exhaust Valve Set 8
Brand: Brian Crower
SKU: brian-crower-brian-crower-02-09-wrx-04-09-sti-ej205-ej255-ej257-1mm-over-std-tip-t14-1676
Price: 197.00 USD
Availability: InStock

Brian Crower 02-09 WRX / 04-09 STI EJ205/EJ255/EJ257 +1mm Over STD Tip (33mm) Exhaust Valve Set 8

$197.00

Only 4 left in stock

Brian Crower +1mm Over STD Tip (33mm) exhaust valves for 02-09 WRX / 04-09 STI EJ205/EJ255/EJ257 engines. Improves airflow for better performance.

Key Features

Fits 2002-2009 Subaru WRX and 2004-2009 Subaru STI models with EJ205, EJ255, and EJ257 engines.
Features a +1mm oversize diameter for improved exhaust flow.
Has a 33mm standard tip diameter.
Constructed from a high-strength, heat-resistant alloy for durability.
Designed for performance engine builds and top-end rebuilds.

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Product Details

These Brian Crower exhaust valves are made with a specific material choice: a high-strength, heat-resistant alloy that can handle the demands of performance engines. They are designed to be 1mm larger than stock, with a 33mm tip diameter, which helps improve airflow out of the combustion chamber. This can lead to better exhaust scavenging and a noticeable increase in engine performance, especially when you're pushing your EJ205, EJ255, or EJ257 engine hard.

When you're rebuilding the top end of your 2002-2009 Subaru WRX or 2004-2009 Subaru STI, using valves that can withstand higher temperatures and pressures is crucial. Brian Crower is known for making well-built internal engine components, and this set of exhaust valves is no exception. The +1mm sizing is a popular modification for tuners looking to extract more power from these Subaru engines, and these valves are built to handle that extra stress.

Installing these valves is part of a larger engine build. Make sure you have the correct tools and follow proper engine assembly procedures, referring to your service manual for specific details on valve installation and setup.