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- USA
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Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
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Description
YOSHIMURA RS-12 Signature Series Slip-On - Stainless Steel/CarbonAfter over three years in development and testing the RS 12 is here! With all its details, the RS 12 takes the system to a new level: Improved performance gains, weight reduction and fit when compared to previous generation design Developed and tested in the heat of over 24 months of factory level racing Aggressive, intelligently designed, asymmetrical shaped RS 12 profile allows maximized muffler volume RS 12 systems utilize precision machined joints
After over three years in development and testing the RS-12 is here! With all its details, the RS-12 takes the system to a new level: Improved performance gains, weight reduction and fit when compared to previous generation design
- Developed and tested in the heat of over 24 months of factory level racing
- Aggressive, intelligently designed, asymmetrical shaped RS-12 profile allows maximized muffler volume
- RS-12 systems utilize precision machined joints : improved system life, fit and performance
- Carbon end cap covers inner cap mounted design improves durability
- Easy to install and remove sound inserts and spark arrestors
- Tapered muffler body inlet design of RS-12 enables the system to be pushed forward thus helping with weight centralization without sacrificing performance
- Proudly designed, developed and made in the USA
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- 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
4.2 ★★★★★
Based on 2103 reviews
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Product Reviews
★★★★★ 5
98% cotton comfort
Color: Black, Size: Large
It's true to size. I have a 42" chest and typically wear a large. I ordered large and it fits. Grab these while you can as most of these mock neck t shirts are a cotton poly blend. These are 98% cotton. This is important because although the cotton/poly blends dry quicker, they are uncomfortably warm if it gets above 70 F. I have purchased other mock turtlenecks and had my local dry cleaners convert them from long sleeves to short, but they are slightly heavier weight than these. I do wish that they made these in a dark green or military green color.
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Reviewed in the United States on March 26, 2026
★★★★★ 1
100% SYNTHETIC CONSTRUCTION!!!
Color: All White, Size: XX-Large, Color: All White, Size: XX-Large
When I bought this shirt, the listing claimed it was 95% cotton and 5% spandex... the shirt that arrived was 51% polyester, 43% viscose and 6% spandex! I have been impressed by some of their other clothing, but this is the first time I was completely lied to and bamboozled. I probably wouldn't have noticed if the shirt wasn't so hot, shiny, and uncomfortable! I will absolutely be returning this shirt. Not even CLOSE to what I wanted. Quite, quite disappointed.
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Reviewed in the United States on April 29, 2026
★★★★★ 3
Just okay for price.
Color: All White, Size: Large
Average quality and fit. The neck is bigger than I would like. Would not purchase again.
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Great product
Color: Black, Size: Medium
Very soft, good-looking t-shirt
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Love it
Color: Royal Blue Gold, Size: X-Large, Color: Royal Blue Gold, Size: X-Large
Light and fits perfectly. I bought this size1X for my 14 year old 6 ft3 225lb son. He has a bit of a belly and is kind of built like a football player.
The pants don’t have pockets but they do have an elastic wast with a drawstring which makes a comfortable fit and no need for a belt. The length is perfect for his height and stops right at the ankles to accentuate the shoes.
The top is also perfect for the length of his arms and torso. The sleeves stop a little below the wrist which is great for movement. The neckline is fitted and he can button it all the way up unlike other fancy shirts and without restrictions .
The fabric is soft and the design on the front looks like a very good quality and is very secure.
Over all I’d rate it a 5/5 for quality and fit. I recommend this to anyone big and tall.
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Reviewed in the United States on June 23, 2022