My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Wiseco 6601M975 Pro Tru Sport Compact Forged Piston 97.5mm Bore -20cc

(1991-1994 Subaru Legacy)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

6601M975
6 reviews
Sale Price

$222.99

Estimated ship date Thursday, November 19

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Wiseco 6601M975 is a Pro Tru Sport Compact Series forged replacement piston featuring a 97.5mm bore diameter, -20cc inverted dome, and an 8.5:1 compression ratio. Designed for the Subaru EJ22 engine, this individual piston is manufactured in Mentor, Ohio using dedicated forgings and precision CNC machining — resulting in a component that is both stronger and lighter than cast alternatives.

Key Specifications:

  • Bore Diameter: 97.5mm (3.839 in.)
  • Compression Height: 33.25mm (1.309 in.)
  • Dome Volume: -20cc (inverted dome)
  • Compression Ratio: 8.5:1
  • Piston Weight: 358 grams
  • Rod Length: 130.5mm
  • Stroke: 75mm
  • Recommended Ring Set: 9750VF

What's Included:

  • Individual replacement piston
  • Plasma moly pre-gapped ring set (1/16 in., 1/16 in., 3/16 in.)
  • Wrist pins and retaining clips

Pro Tru Sport Compact Series Features:

  • Forged aluminum construction using dedicated forgings specific to the final piston shape for superior strength-to-weight ratio
  • Precision CNC-machined to final configuration by skilled Ohio craftsmen
  • Plasma moly ring package delivers excellent cylinder seal, reduced friction, and extended service life
  • Available in multiple dome volumes, allowing engine builders to dial in exact compression ratios
  • Designed to handle performance applications including turbocharged and high-output builds

Wiseco's Pro Tru Sport Compact line delivers race-proven forged piston technology in an accessible, shelf-stock format. Sold individually — order the quantity required for your engine build. Cross-reference ring set: 9750VF.

Products specifications

Fits

1991-1994 Subaru Legacy

Bore

97.5mm

Comp Height

33.25

Comp Ratio

8.5:1

Dome Volume

-20

Gram Weight

358

Rod

130.5

Stroke

75

A very satisfactory experience. The price I paid was the lowest I found on the internet for this product. Ordering was easy, and without hassle. My order was shipped promptly and arrived sooner than I expected. Order date to receipt was only 6 days

Ordered EBC brake rotors on Tuesday afternoon and received notification on Thursday morning that they have already been shipped. Fast order processing and a low price, what more could I ask for? When I need to do the front brakes, I will be coming here first.

yes happy after a good customer serice helped with a price adjustment to my order. they did have good prices on most things, but it took some work to find the lowest price, so you do need to be a smart shopper.

First time I've tried these guys. Had trouble getting this product from my normal source (backordered) but Autoplicity shipped quickly and had a better price too! You know I will be back! Thanks!

Easy!

Ordered a Thule Bike Rack from Autoplicity and was greatly pleased with the price. It was the best on the internet. There was an issue with the shipment of the item and some confusion but this was resolved in a professional manner by a customer service manager. Overall, I'm pleased I got a deal.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy