Porsche 911 CSR sports cat upgrade.

My CSR has definitely been the most driver focussed toy I’ve owned to date, but something was missing. It will cruise near silently at 70mph which is a welcome change from my normal idiotic escapades, but the throttle response always left me wanting.

Despite a lightened clutch and flywheel the CSR and standard mapping always had a sluggish throttle pedal, you literally stamp on it for any form of Rev-matching. This gets a little tricky when your right foot is already occupied with braking before a tight left hander in the Lake District. I’d repeatedly find myself unable to get the revs to spike in time before slotting the next cog.

The massive factory 400 cel cats really limited the CSR’s sharp and focussed character. After a lot of swearing and 5 of 6 snapped bolts, I’d removed the offending catalysts. Unfortunately the Lambda sensors were welded in place so new Bosch ones had to be sourced asap. The new 200 cel cats slotted into place perfectly, lining up with the CSR bespoke back boxes from Rpm Technik. The result is a dirty raspy noise high up the Rev-range reminiscent of an E46 M3 CSL.

The CSR feels transformed with a new sense of urgency and desire to Rev and get going. Nearly 4kgs were shed from the back end also. Despite the rebuild in 2017 I often worried for some of the original factory parts left on the 996, the cats being one of them, it’s not unusual for them to rot completely away. I even managed to get £220 for them which was a welcome contribution. I can’t say enough for the noise I’m shocked how good a flat 6 from this era can sound it encourages you up the revs just to hear it growl. I’m very pleased with this upgrade overall, would recommend.

Published by Sam Busby

a big nosed bearded idiot who likes to write about cars. Lucky enough to have owned a few quick ones too.

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