Despite the bad rep of old catalysts, modern catalysts do not rob significant amounts of power. I've seen dyno sheets of catalyst deletes netting less than 5hp. They do a great job of preventing your car from being a gross polluter and removing it is just plain irresponsible. If there is a problem with your catalyst it will be because of a problem with the engine that has damaged it, otherwise they tend to have a long and efficient life. How about getting a professional diagnosis of your power loss instead of immediately deciding it would be a great idea to turn a clean car into a gross polluter?

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff