SKU: 20201478573
why are straight cut gears better

why are straight cut gears better IAG Performance 1st-4th Straight Cut Gear Set

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Description

why are straight cut gears better IAG Performance 1st-4th Straight Cut Gear Set2004 2021 Subaru WRX STI 1st 4th Straight Cut Gear Set by IAG Performance Gone are the days of blowing up stock six speeds, or having to resort to race only solutions to support the high power levels that built Subarus now produce. The IAG Spec PPG Straight Cut 1 4 Synchro Gear Set is designed for weekend racers (and weekday racers for that matter) who prefer the streetability of a synchronized gearbox which is suitable for daily driving. The kit

2004-2021 Subaru WRX STI 1st-4th Straight Cut Gear Set by IAG Performance

Gone are the days of blowing up stock six speeds, or having to resort to race-only solutions to support the high power levels that built Subarus now produce.

The IAG-Spec PPG Straight-Cut 1-4 Synchro Gear Set is designed for weekend racers (and weekday racers for that matter) who prefer the streetability of a synchronized gearbox which is suitable for daily driving. The kit features strong, straight-cut gears (vs. traditional helical gears) which provide maximum performance and durability for high horsepower Subarus and can be safely driven on the street.

IAG engineers worked directly with PPG to specify custom gear ratios which allowed us to increase top-speed in 1st and 4th gear. This change will prevent extra shifts while drag racing. Additionally, the gearset is designed to utilize the OEM 5th and 6th gears for quiet highway operation and maximize streetability.

While the synchronizers improve drivability for the street, the taller 1st and 4th gears are the stars of the show when it comes to racing and all-out acceleration. A 1st Gear Ratio of 3.077 results in an 8-10 mph increase vs. OEM (years vary) while the new 4th Gear Ratio of 1.042 will ensure that you finish out your quarter mile pass without shifting to 5th.

Sub 10-second street Subarus are all the rage right now. The partnership between IAG and PPG combines our experience to offer a robust but versatile combination that appeals to those who want the strength of a built transmission, but don't want to give up driving the car on the street. Pfitzner’s legendary strength and durability paired with IAG’s insight on gear ratios and specifications has resulted in a product that we know will be a game changer in the Subaru community.

Features

  • Longer Gear Ratios for Less Shifting

Benefits

  • Stronger than OEM to Handling Higher Power Outputs

Applications

  • 2004-2021 Subaru WRX STI

What's In The Box?

  • 1 - Input Shaft
  • 1 - 1st Straight-Cut Output Gear
  • 1 - 2nd Straight-Cut Output Gear
  • 1 - 3/4 Straight-Cut Cluster Gear
  • 1 - 3rd Straight-Cut Input Gear
  • 1 - 4th Straight-Cut Input Gear
  • 1 - Clutch Input Shaft
  • 1 - Reverse Idler Gear
  • 1 - Input Shaft C Clip
  • 1 - Retainer Key

Warranty

  • IAG Performance's Limited Manufacturer's Warranty
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 20201478573

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Verified Purchase
KimberlyY
Belleville, US
★★★★★ 5
Uses same battery as the rest of my equipment
Size: 8" Edger New
Since I already have and like the Greenworks mower, string trimmer and blower it only made sense to get the edger. Even better that I didn’t need to buy more batteries. I tried another name brand electric edger and returned it for not holding a charge. This one works great! There’s charge left in the battery after everything has been edged. I was concerned how easy it would be to control but fell in love with it first time I used it. To use just pop the battery in, flip the thumb lever, squeeze and edge. Not as noisy as gas powered equipment and no cords to pull. Feels sturdy in my hands and a good weight that’s enough to not pop up if it hits something but not too much to be heavy to carry back to the shed.
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Reviewed in the United States on October 29, 2025
T
Verified Purchase
Texas Gal
Bozeman, US
★★★★★ 5
First use was great!
I've used it just the one time today. I had previously "edged" with a string weedwhacker, so while the grass was cut back some, there wasn't a trench dug out. I did a gentle push and pull, taking on about 18" at a time to get a new trench dug next to the sidewalk edge. It did a great job! The entire unit was much heavier and sturdy looking than I was afraid it would be for the price, so pleasantly surprised. Assembly wasn't complicated, but it did take two of us to hold it steady because getting the screws to seat in the square hole and not have the cord in the way was a bit tricky. I'm a 70+ lady, not large and not athletic, but I was able to handle this edger with ease. Now, to see how long it lasts!
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Reviewed in the United States on July 11, 2025
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Verified Purchase
James E Morris
Fort Morgan, US
★★★★★ 5
Not expensive
Gets the job done
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Reviewed in the United States on April 27, 2026
K
Verified Purchase
Katy
Lexington, US
★★★★★ 4
Great Yard Helper!
So easy to use and affordable! This edger is a great time saver, easy to operate, and relatively easy to adjust although you may need a pliers or screwdriver to help with the adjustment levels, but its not difficult. I would have given this 5 stars but just one thing that is a sticking point for me is I wish this had its own stand or hanger because of its odd shape, it doesn't necessarily balance upright too well. It’s long and the guide wheel in the front sticks out. So, it is always awkward to get it tidy in the garage when not in use. Now maybe this is what it's like for landscapers…I’m not a professional. Just a homeowner doing my own upkeep. With what this costs, I’ll figure it out, and is worth the money.
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Reviewed in the United States on December 30, 2024
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Dan Y
Grantham, US
★★★★★ 5
Easy to use
Easy to assemble. Works as advertised
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026

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