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Description
1999-2000 Mazda Miata MX5 1.8L 4-2-1 SS 1-5/8 Header XForce HS-9918Enhance Your Mazda MX 5's Performance with the XForce 4 2 1 Stainless Steel Header Upgrade your 1999 2000 Mazda MX 5 Miata's exhaust system with the XForce 4 2 1 Stainless Steel Header (Part Number: HS 9918). This high quality header is engineered to improve exhaust flow, resulting in enhanced engine performance and a more responsive driving experience. Key Features: Tri Y Design: The 4 2 1 configuration optimizes exhaust scavenging, leading to
Enhance Your Mazda MX-5's Performance with the XForce 4-2-1 Stainless Steel Header
Upgrade your 1999-2000 Mazda MX-5 Miata's exhaust system with the XForce 4-2-1 Stainless Steel Header (Part Number: HS-9918). This high-quality header is engineered to improve exhaust flow, resulting in enhanced engine performance and a more responsive driving experience.
Key Features:
- Tri-Y Design: The 4-2-1 configuration optimizes exhaust scavenging, leading to increased horsepower and torque across the RPM range.
- Stainless Steel Construction: Made from durable 304 stainless steel, this header offers excellent corrosion resistance and longevity.
- Precision Engineering: Mandrel-bent tubing ensures smooth exhaust flow, while CNC-machined flanges provide a secure, leak-free fit.
- Fuel Type: Gasoline
- California Prop 65 Warning: This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Specifications:
- Brand: XForce
- Type: Exhaust Header
- Items Included: Header, Gaskets, Mounting Hardware
- Material: 304 Stainless Steel
- Substrate Material: Stainless Steel
- Primary Tube Diameter: 1 5/8 inches
- Header Style: Tri-Y (4-2-1) One-Piece Design
- Collector Attachment: 2-Bolt Flange
- Finish: Natural Stainless Steel
- Features: Mandrel-Bent Tubing, CNC-Machined Flanges, Bolt-On Installation
- Fuel Type: Gasoline
- Placement on Vehicle: Front (Engine Bay)
- Manufacturer Part Number: HS-9918
- OE/OEM Part Number: HS-9918
Vehicle Compatibility:
This header is designed to fit the following Mazda MX-5 Miata models:
- 1999-2000 Mazda MX-5 Miata: 1.8L 4-cylinder engine
Note: While some references indicate compatibility with 1998-2005 models, it is recommended to verify fitment for models outside the 1999-2000 range.
Items Included:
- XForce 4-2-1 Stainless Steel Header (HS-9918)
- Gaskets
- Mounting Hardware
Installation Notes:
- Professional Installation Recommended: Due to the complexity of exhaust system modifications, professional installation is advised to ensure optimal performance and fitment.
- No Welding Required: Designed for a bolt-on installation using standard hand tools.
- Complete Kit: Includes all necessary gaskets and mounting hardware for a complete installation.
Upgrade your Mazda MX-5 Miata's exhaust system with the XForce HS-9918 header to experience improved performance, durability, and a more exhilarating driving experience.
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
4.7 ★★★★★
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Product Reviews
★★★★★ 4
Great pillow !
Size: Queen
This pillow met my expectations. Very comfortable with the right amount of firmness. Love the shape as well.
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Reviewed in the United States on January 6, 2026
★★★★★ 5
This is everything you could want in a good pillow for a good sleep
Size: Queen
This is truly the very best pillow on the planet. So really comfortable, doesn't loose its shape and for a good sleep, this is it.
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Reviewed in the United States on May 5, 2026
★★★★★ 5
This is Truly the Best Pillow!
Size: Queen
This is the side sleeper version of the best pillow out there.
My 26 year old son was always complaining about his pillow and his neck and back hurting. About every year I’d buy him the next “best” pillow promising to be the best but they never worked for him. I read an article saying THIS pillow was the “Goldilocks” of pillows. So since he sleeps in all positions, I got him the regular shaped pillow. The next morning after his first night with the pillow, he came out of his room talking about how wonderful his pillow is. Same thing the next morning. And the next. And the next. Then I thought to myself, my current pillow is the best I’ve had but I’m not in love with it. But I’m a side sleeper so I purchased this particular contoured pillow for me. NOW I UNDERSTOOD WHAT MY SON WAS TALKING ABOUT. I became the person who went on and on about my pillow. Until my husband told me to replace his with one of these side sleeping versions for himself. And he loves it. Then we got a regular pillow (for those who sleep in all positions, but this same company) for our guests. My best friend came to visit, immediately noticed the pillow upgrade from previous visits and when she returned home, she purchased one for herself.
This pillow is like a feather pillow except it is filled with tiny squares of memory foam. And it comes with an extra pack of stuffing, so you can add or remove stuffing to customize it perfectly for you. None of us in the house added filling, and my son removed some that came with his pillow. I also sleep with a body pillow and have for years. And I was wishing this came in a body pillow version until I realized I could make my own. I bought a zippered body pillow case. The larger size. I think it was 54 inches long. And I bought a king size pillow and used the extra stuffing pack that came with that pillow along with the 4 packs that came with the other pillows that we didn’t use. Though you could probably do the same thing with two standard size pillows. These pillows are on the expensive side but they go on sale during every holiday. That’s when I purchase them. Oh and my body pillow is HEAVEN. Between that and the pillow, I spend my nights in fluffy cloud goodness.
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Reviewed in the United States on May 31, 2026
★★★★★ 3
Not as great as I was hoping.
Size: Queen
I was hoping this was going to be my miracle pillow. I have had terrible neck pain for years. It arrived with too much stuffing. Removed some and it caused terrible occipital headaches. I’ve slowly been adding stuffing, hoping to find the right fit.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Best pillow ever!!!
Size: Sapphire Queen
I have actually tried dozens and dozens of pillows in my life, and dozens in the past three years, but this is it. Some cheap, some very very expensive, and some very famous brands. This one beats them all. So awesome and comfortable (side sleeper). I tried one and loved it so much I ordered a second right away. It is exactly what I've been searching for forever!!!
Stays in shape, extremely comfortable. Only thing is you definitely need a 32" pillowcase to cover it, and I wish they made a 34" pillowcase, but no luck. I used the pillow the same night and it's definitely worth the money.
No neck pain, super squishy but supportive, and no odor.
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Reviewed in the United States on October 31, 2025