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Celebrating 20 years of selling the highest quality parts at the lowest prices. Guaranteed.

What Our Customers Say

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"Meredith, You're my favorite customer service person of all time, just to let you know how highly I think of you. I tell all my car buddies to ask for you by name."

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"Thanks for the response. We have an inside joke that you guys only hire ninjas with how fast your service is. SIS is definitely the first place I check for parts. You guys have a great thing going on there. Thanks!"

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"Loved your last products. Very well made. Welds were superb on the steel tail blow off valve flange."

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"4th time returning customer thanks guys always good service."

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"Dana B and sis.com [1], Thanks for the solidly good customer service. I look forward to getting my order. -S. P. Henry "

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"Hi just to let you know that i have receive my order, and the only thing i can say is WOW ! ... THe product is simply amazing and look great, thank you so much for such an easy transaction, i will come back for sure !! Thank and have a nice day !!"

1.5" Parts

1.625" Parts

1.75" Parts

2.0" Parts

2.25" Parts

2.5" Parts

2.75" Parts

3.0" Parts

3.5" Parts

4.0" + Parts

Schedule 10/40

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Silicone Couplers

Air Filters, Tools

AN Fittings

Aluminum Radiators

Pumps, Fans, Gauges

Clamps

Aluminum Intercoolers

Blowoff Valves

Thanks for visiting! Here's a quick checklist to help you make sure you're getting the right pipes for your installation.

Make sure your pipes have mandrel bends!
Our aluminum bends and stainless steel bends all have mandrel bends*, which are far superior to the press bends that some retailers sell. Mandrel bends maintain a uniform inner diameter through the bend, unlike press bends which are easier to manufacture and get smaller in the bend. This means that mandrel bends flow better and can be cut and welded on the bends.
Make sure your pipes look great!
Our aluminum pipes and stainless steel pipes have an incredible mirror-polished finish*. A lot of installers cut corners here, but why bother when our prices are so low for show quality products?
Make sure your pipes are the right size!
Our aluminum pipes and stainless steel pipes are listed by outer diameter*, as is typical in automotive intake, exhaust, and other piping systems.
Make sure your pipes are the correct material!
Our aluminum pipes are 6061-T grade*, with good weldability, machinability, corrosion resistance and light weight. Our stainless steel pipes are 304 Stainless Steel*, with excellent rust resistance and easy welding to many existing components.

*Information refers to our main product line - some products may vary. Please check our product descriptions for full details.