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Exhaust

Although easy to overlook, a proper exhaust is critical for any and every project. Each build has its own needs, so it is important to note that one size does NOT fit all here. Piping diameter, shape, types of bends, types of collector, and even material all effect what your car sounds like, the noise level, how much power you make, and where you make it. Remember, bigger isn't always better! Sometimes exhaust gas velocity (not backpressure) is more important than peak flow numbers.

You'll find all sorts of articles and how-to's mentioning that "a little bit of backpressure is important, especially for N/A engines." This isn't entirely true. You don't really want any back pressure, as that backpressure is stopping the efficient flow of exhaust out the tail pipe. What is actually needed is the proper diameter piping, which influences the speed of which the exhaust is traveling. When you switch to a larger diameter pipe, you can get more flow out of that pipe and the cost of what speed that gas is flowing at. What this means in real world terms is that if you swap out your exhaust for a larger, high performance version, you'll be trading low end torque for more HP in the upper RPM range.

There's much more that goes into exhaust design than just that, but those are the basics. A proper exhaust will not drone during interstate/high speed cruising, will not sacrifice much low end grunt, and will help your engine breathe better, making your car sound better and more powerful!

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  • XAT Racing Mk3 Supra Test Pipe 86.5-92 MkIII Toyota Decat

    Please note due to draconian laws, we are not able to ship these to a California address. Please support the RPM act.

    Watch Andy show off his pipe. Impressive! With a girth of 3 inches, his pipe offered by hand will absolutely make you smile! This is an in house made XAT part, hand welded on a jig, and factory replacement fitment with no modification needed--for your pleasure.

    You will need to measure your existing cat to make sure we send you the right version, usually either 11 inches or 12 inches roughly. Please let us know at the time of ordering what yours measures out to be. It is important to get the correct length the first time to avoid further issues.

    What is a test pipe?

    Simple. A test-pipe is used to replace the catalytic converter on cars to "test" if the cat as clogged or not and will verify for you. Simple bolt-in performance product with only 4 bolts (can be obtained at any hardware store if not reusing the factory ones). Excellent bang for the buck performance. Test pipe can be used with various downpipes for total CAT elimination (catalytic converter), or it can be used with a factory exhaust or aftermarket exhaust as well.

    Please check your local laws, as this is intended strictly for off-road vehicles only. It is up to you to reinstall the cat when you are done using this. 

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    • $165

  • JDM 2JZGTE Supra Front Pipe Decat Downpipe RHD test pipe

    We are now stocking the very hard to find stainless steel 304SS front pipe (cat delete)! As you probably know by now, none of the full downpipes we have on our site fit on the JDM Supra's, so we had these built.

    These are designed specifically for RHD 2JZGTE Supra's (non VVT-i) and eliminates the first catalytic converter. It is custom mandrel bent of 76mm diameter tube, flanges laser welded, O2 sensor port machined and fitted then machine polished.

    It comes complete with gasket (upper) and new bolts. Expect a 20-30 HP gain (depending upon boost levels) with this front pipe cat delete for the Supra. It helps free up the exhaust, which is critical, but also if you delete both CATS on the JDM cars, then you are a candidate for runaway boost and lack of boost control. With a front pipe, single CAT delete, you will not over boost those ceramic turbos that come standard on the JDM 2JZGTE Supras.

    There's a built in flange for the O2 sensor as well! Gasket for that is also included.

    Great bargain, simple install and makes power, period. These are very hard to come by, so please buy when you see they are available. We are one of the only Supra businesses that has these on the shelf, at all times!

    Please note this does not fit the RHD Aristo. This will fit the LHD cars with JDM non-VVTi engines specifically on the turbo side. 

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    • $230

  • XAT GS400 Test Pipes GS430 UZS160 UZS161 Decat

    Please note due to draconian laws, we are not able to ship these to a California address. Please support the RPM act.


    In house custom made bolt on UZ test pipes! These are confirmed as bolt on replacement GS400/GS430 pipes, and very likely fit a number of other 98+ UZ cars as well, though we have only confirmed fitment on the GS400 and GS430. We will add confirmed fitment to this listing as we confirm what other cars these replace. Price includes both sides for installation on 1 car.

    • 3" stainless steel
    • Stainless flanges
    • Both pipes included
    • 100% bolt on!

    These are for off-road use only and are not meant for any on-road vehicles. Buyer is responsible for obeying all laws, local and federal.

    You may get a check engine light/MIL/CEL code with these. Gaskets/hardware not included. We strongly recommend using something like permatex ultra copper to provide a better seal, rather than going through a number of aftermarket poor quality gaskets without luck. This is what we do with all of our own vehicles, and we have found the seal to be much better that way!

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    • $299

  • PHR Full Titanium Exhaust for 1993 to 1998 MKIV Supra PowerHouse Racing

    Performance meets style with our new MKIV Supra Exhaust system. This Full Titanium Exhaust features a removable V-banded muffler section for proper seal compared to slip joints on most systems out there. Including the clamps it weighs in at 12.9lbs The muffler itself has a burnt finish to complete the iconic Supra rear view.


    This exhaust is a perfect match for anyone currently making or planning to make over 800 rwhp with full 4" piping. With a near 30 year track record of making only the highest quality products, you can be sure that this PHR exhaust system will not disappoint!

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    • $1,705.25

  • XAT DIY Stainless Dual 2.5 inch Exhaust Kit LS400 GS400 SC400 LS430 Custom Fabrication

    Fabricate your own exhaust for your ride! This kit is for popular vehicles with UZ engines, and there are plenty of ways to option it out for your preferred setup. All parts and piping are quality T304 stainless steel. U-J bends are mandrel bent, not crush bent, as to keep even and consistent flow.

    Base kit includes:

    • (4) 2.5" U-J bends 
    • (2) 5 foot sticks of straight tubing 
    • (2) stainless Vibrant mufflers
    • (2) flex joint couplers

    PLEASE NOTE THIS IS FOR OFF-ROAD, RACE ONLY APPLICATIONS ONLY. Modifying and tampering with factory emissions equipment is illegal in many jurisdictions, so please consult your local laws BEFORE ordering. 

    This kit is NOT available to ship to California.

    This is also NOT a 100% complete kit. You will need a competent welder to finish up the rest on your specific chassis. Different and additional parts are also available by request! Please contact us for a shipping quote if you're not located in the US 48 states.

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    • $845

  • XAT LS400 Test Pipes UCF10 89-94 Celsior Decat

    Please note due to draconian laws, we are not able to ship these to a California address. Please support the RPM act.

    In house custom made bolt on UZ test pipes! These are confirmed as bolt on replacement early zenki LS400 (1989-1994) pipes, and might fit other 1UZ cars as well. These should also fit 1991-1994 SC400s, but we have not confimred fitment.

    We will add confirmed fitment to this listing as we confirm what other cars these replace. Price includes both test pipes.

    • 3" stainless steel
    • Stainless flanges
    • Both pipes included
    • 100% bolt on!

    These are for off-road use only and are not meant for any on-road vehicles. Buyer is responsible for obeying all laws, local and federal.

    You may get a check engine light/MIL/CEL code with these. Gaskets/hardware not included. We often use high temp gasket maker like permatex ultra copper, ultra black, etc. as replacement gaskets.

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    • $299

  • XAT 3UR Header Flanges billet 3URFE 1URFE exhaust manifold weld flange

    Looking to upgrade your rig with new headers? Maybe doing a UR engine swap and need to fit a custom set? Or perhaps youre looking to add a turbo or two to your Toyota 5.7 or 4.6 truck V8? In any case, we have you covered! These are 3/8" thick stainless steel.

    As is typical from us, another first to market product! Price is for both, 1 pair for 1 engine!

    These likely fit other UR engines as well, however we have not yet confirmed fitment. They might fit 1URFSE and 2URGSE heads, but we have not test fit on those engines yet. They are made specifically for 1URFE and 3URFE/3URFBE engines, as seen in the Tundra, Sequoia, GX460, Land Cruiser, LX570, and overseas LX460.


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    • $320
    Sorry, we only have 2 of that item available

  • XAT Crown Catback Exhaust JZS155 hardtop Royal Saloon or Touring Full Stainless


    Looking to add some style and wake up that Crown a bit? XAT can make you a custom stainless exhaust! This would bolt directly to your factory 2 bolt cat and replace everything up to and including the muffler.

    These are custom made to order, so we're able to make variations and changes to suit your tastes! Looking for a different style muffler? Single tip? Flat black? Let us know what you're looking for, and we can get you covered. 

    Each exhaust is hand made on an actual JZS155 Crown, so fitment is sure to be right. Fits hardtops and sedans. Not compatible with JZS155 Majesta. Please note this exhaust is strictly for off road use only. Check your local laws before purchasing. Depending on what style muffler you are using, you may need to clearance your stock bumper cover. Open a dialog with us if youre looking to avoid this

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    • $1,099

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