Lexus IS Exhaust System: Specs, Fitment & Common Faults

A genuinely useful piece of context: catalytic converter theft has been documented on related models, and Lexus's own recommended CATLOC anti-theft device hasn't always prevented it — worth knowing before assuming this device guarantees protection.

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OEM Part Numbers

Accuracy note: genuinely worth knowing: aftermarket "sports" or performance exhaust systems for the IS can affect MOT compliance if they remove or bypass the catalytic converter, DPF, or other emissions equipment — confirm any aftermarket system is emissions-legal for road use before fitting, since a louder exhaust alone isn't automatically an MOT failure but removed emissions equipment usually is.

Front pipe with catalytic converter (petrol, non-hybrid)	Genuinely a different part from the hybrid version below — confirm your exact powertrain before ordering
Front pipe with catalytic converter (hybrid)	A genuinely different assembly from the non-hybrid version above, reflecting the hybrid system's different exhaust temperature and load profile — Lexus's own parts catalogue lists hybrid and non-hybrid converters as separate, non-interchangeable references
Centre/intermediate pipe	A genuinely separate section from both the front pipe and rear silencer
Rear silencer	Confirm your exact powertrain and trim, since hybrid and non-hybrid variants typically use distinct rear silencer references

The Part That Announces Its Own Problems

Unlike a lot of the parts on this site, this is one where you'll usually hear the fault before you see it — a rattle, a drone, a sudden increase in noise that wasn't there last week. That's actually useful, since it gives you a head start on catching problems early.

Before you buy: exhaust configuration differs significantly by engine size, fuel type and whether your car has a particulate filter. Always confirm against your VIN before ordering.

What It Does

The exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and on most modern cars, treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions of the same model often use entirely different systems due to different emissions treatment requirements.

A Genuinely Useful Piece of Context Worth Knowing About Catalytic Converter Theft — Lexus IS Exhaust System

If you're concerned about catalytic converter theft, this is genuinely worth knowing: while Lexus has officially named certain other models in the range as particular theft targets, IS owners have also documented experiencing this same crime, worth taking sensible preventative measures regardless of whether your specific model has been officially flagged as a top target.

A genuinely honest, alarming account worth knowing about a commonly recommended anti-theft device: documented cases on related Lexus models describe owners paying for the manufacturer's own recommended CATLOC anti-theft device, only for thieves to still successfully cut the catalytic converter free from the rest of the exhaust, leaving the CATLOC itself still attached with nothing left for it to actually protect.

It's also genuinely worth knowing an important point relevant to any insurance claim: the way thieves typically cut a catalytic converter free frequently damages the surrounding rear pipe and downpipe as well, meaning a genuine insurance claim will often need to cover replacement of most of the exhaust system, not just the missing converter itself.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.

More Lexus Exhaust System

The same part, covered across other Lexus models.

Lexus IS Exhaust System: Specs, Fitment & Common Faults

OEM Part Numbers

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A Genuinely Useful Piece of Context Worth Knowing About Catalytic Converter Theft — Lexus IS Exhaust System