In stock form you should be fine. Since you're doing exhaust work install a Wideband AFR gauge. Mine isn't running lean and I have the injen CAI, upgraded SMIC, 3" DP + exhaust, upgraded exhaust mani. No tune runs great, love the MSP ;)
Sad to hear you are parting with your MSP. I'm an OG owner as well of a 2003 MSP (mica black). Mine is pretty much still in stock form (only a couple bolt-ons) but looking to update/upgrade parts. I'd love to see what extra parts you have that aren't on the car.
Cheers
USERNAME: YAMADAFAWKA
STATE CAR RESIDES: CA
Year 2003 or 2003.5: 2003
PRODUCTION NUMBER: 164
COLOR: BLACK MICA
YEAR BOUGHT: 2003
YEAR SOLD (if you sold it): N/A
BEST PIC YOU HAVE OF YOUR CAR (not needed if you don't have one):
Good communication, transparent and honest member. Shop, Inquire, Purchase with confidence!
John - I'll probably be asking for a few more things. Haven't had a chance to dig into anything yet. Been busy and will be still for the next couple weekends but will let you know as soon as I can.
Hey @Mikeyman64 - just received your shipment today, thanks for packing it nicely and shipping it timely! Shop with confidence with Mikeyman64 ya'll.
Cheers
pope exhaust mani is now being sold at - https://www.speedcircuit.net/index.php/protege/engine-bolt-ons-manifolds/pope-engineering-performance-pep-mazdaspeed-protege-turbo-manifold.html