Hey, I'm all for performance. I have a fair bit of mods and I run 9lbs of boost on my daily driver 300TE 4-M. I also run two catalysts on the car. Would it have more power without them.... a little yes. Is that little bit worth turning a daily driver into a gross polluter... not in my opinion. It's a daily driver, not a race car. If you gut the catalyst on any driver, I assure you it wont be a race car. It will still only be a daily driver. Just one that I wouldn't want to be associated with the brand that I love.

Don't take it as a personal attack. I'd love to see your car with a nice custom exhaust and either the stock catalyst or possibly a nice high flowing aftermarket catalyst if you can tune the engine to take advantage of additional flow. With a near stock engine I'd be careful about going too large of diameter. It will drone like crazy, even with a catalyst.

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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