The direct adjustment catalyst conforms to Californian quality CARB standard MagnaFlow 441021 helps keep the engine control light off. DIY installation is easy with the right tools (no cutting or soldering required). With features such as curved mandrel pipes to remove flow stress and corrosion-resistant stainless steel construction, you can rely on the quality of this catalyst. By using state-of-the-art 3D scanning systems in the design process, MagnaFlow`s metrology department ensures that this new part fits and functions as original equipment. This direct-mount catalytic converter is specially designed for the 2001-2004 Lexus IS300 and can be replaced with original part 17410-46520. Avoid possible exhaust leaks by using the supplied gaskets to obtain a suitable seal. This replacement part is designed to meet or exceed California Air Resource Board requirements and has undergone additional testing to meet CARB guidelines to allow legal use in California and restricted CARB states for listed vehicles. This is as close as it can be to the Mazzuri and Xerd headers. These collectors, jointly developed by PPE Engineering and Figs Engineering, are currently among the best IS300 collectors you can buy. If CARB compliance is not at the top of your priority list, Flowmaster headers should be investigated. Note that they are approved by the federal government/EPA. OBX manufactures longrunner and shortrunner collectors. What we`ve listed here is the Chatless Longrunner variant designed for IS300 owners who prefer performance.
Quality control issues are common with these headers, but the 8-year/80k mile warranty makes up for that risk. The best IS300 headers have been dropped and it`s damn impossible to find them used. Especially long-tube riders, such as Xerd and Mazzuri, used to produce. Replacing your OEM exhaust manifold with replacement manifolds is a small business, but if you don`t do it yourself, expect to pay around $350 for a deal to do it for you. With that out of the way, let`s jump into the list you`re here for. Below we have listed both catted OEM replacement headers and catless race headers. Choose the latter if you want performance and the former if you want a solution. MagnaFlow headers are an exception because they are known to contain more precious metals in the Cat-Con than most other options.
The quality is not OEM level, but it is as good as it gets. The only problem is that at the time of writing, it is quite difficult to find a good set of headers for the Gen 1 XE10 IS300. If you`re looking for IS300 headers, you`ll come across some that have built-in catalysts and others that don`t. It`s not easy to find replacement headers that come with very good catalysts. Due to the high cost of catalysts, manufacturers tend to cut corners to reduce costs. But that doesn`t mean you have to get stuck with your warehouse distributor. In this article, we have listed some of the best OEM exhaust manifolds and manifolds that you can buy for your IS300. Keep in mind that if you can`t find exactly what you`re looking for, custom headers are also an option, especially if you intend to keep your 2JZ-GE atmospheric. Surprisingly, these headers don`t get too noisy and have an acceptable amount of drones, which is very different from longrunner headers. If you`re looking for a simple OEM replacement exhaust manifold and don`t want to spend a lot of money, Dorman manifolds are the best option. Expect a noticeable bump in the mids, depending on the melody of course. Overall, these headers are a fantastic deal.
They are inexpensive, well built and not very difficult to obtain. If you want to comply with emission standards and don`t mind a slightly restrictive header design, Cat-Con-equipped options are worth a look. From a performance perspective, you want to get headers without cat. These are available in both CARB compliant and non-CARB compliant variants. The latter is much cheaper. One small problem you will encounter is that your OEM heat shield may not match these headers. The only complaint with these headers is the lower joints that come with them. You can remedy this by purchasing OEM seals. The Gen 1 IS300 has 3 catalysts and 4 O2 sensors; 3 on the exhaust manifold and 1 on the Y-pipe. By installing spare headers, you remove the two cats that are in front of one of the O2 sensors. Designed to meet or exceed California Air Resource Board requirements, this replacement part has undergone additional testing to be certified by CARB for legal use in restricted CA/CARB states for listed vehicles.
CALIFORNIA WARNING: Cancer and Reproductive Damage – www.P65Warnings.ca.gov Manufacturer: PPE EngineeringItem No.: IS300_ELHEADERConstruction: Stainless SteelPrimary Pipes: 2.25″ Design: Graduated primary long tube, catless catalyst, 441021 is designed to meet California`s emission standards as well as those of other CARB regulated states. Manufacturer: FlowmasterItem number: FLO-2054276Construction: stainless steelPrimary tubes: 2.5″ Design: short tube, built-in catalyst The Cat-Cons you get with these are not made by Flowmaster itself, but they are of reasonable quality. Installation is simple, except that the throttle body must be removed to fit it properly. State-of-the-art 3D scans ensure that this catalytic converter directly tailored to your vehicle fits perfectly with your vehicle and allows for do-it-yourself installation. All required hardware is included. Although they are listed as “catalysts”, the package includes the interchangeable dispenser with integrated catalysts. The MagnaFlow header is an ideal replacement for your OEM exhaust manifold. It`s curved into spines, CARB compliant, doesn`t give you an engine light, and the exhaust tone of your IS300 is only slightly louder and deeper. Extensive testing and certification processes are followed to ensure that 441021 meets the emission standards set by the CARB (California Air Resources Board). This catalyst is also compliant in countries that comply with these standards.