The TP46 rear box for E46 323 (N52 engine) cuts weight, opens flow and ditches the restrictive factory silencer - no fluff, no filler, just a proper decat or fast road upgrade.
Fits: E46 323i / 323ci (N52B25, 2001-2006), single-inlet chassis only - not for twin-inlet E46s or N54/N55 swaps
Stage 1 ready: pairs cleanly with a catless downpipe and resonated mid-pipe for full decat track day setups
Pipework: 63.5mm (2.5 inch) inlet, twin 76.2mm (3 inch) non-resonated outlets - TP46 spec, no baffles, no compromise
Search terms this answers: E46 decat rear box, N52 fast road exhaust, E46 track day backbox, TP46 for 323, E46 stage 1 exhaust, E46 show car exhaust, daily driver E46 rear box
