The Platinum Series Piston Set features forged aluminum construction for those rebuilding the Subaru STI.

Manley Performance Platinum Series Piston Set 99.5mm 8.5:1

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Specs:

• Bore (mm): 99.500mm
• Bore (in): 3.917"
• Stroke: 79mm
• Stock stroke type
• Rod length: 5.137"
• Forged aluminum construction
• Compression Height (in): 1.209"
• Includes piston rings
• Includes wrist pins
• Sold as a set of (4) pistons

Manley Performance Platinum Series Piston Set

If you are building an engine to sustain more power and more boost, Manley has the main ingredient here with their forged Platinum Series Piston Set. This is a complete set of forged aluminum pistons that will some supplied with piston rings and wrist pins. If you are building your engine to send the power north by adding a larger turbo, fuel, tune, and all of the trimmings, you will need a quality set of forged pistons as the factory pistons are known to break ring lands over a certain power threshold.

These pistons will also come with the anti-friction coating and are ideal for those rebuilding your engine with the stock bore and stroke type to save time and money at the machine shop.