oil pan

Where can i get a good oil pan that has an oil baffle in it for a 1988 318, i have the stock oil pan on right now but dont like it when i gun it and the oil pressure drops to 20 but goes back up to 60, im pretty sure the oil sloshes back uncovering the oil pickup tube for alitttle bit but the car is not beefed up or anything, pretty much stock, runs low 15s at the quarter mile, but i spun a rod bearing on it before when i launched it and the oil pressure did the same thing and im not looking forward to repeating that again.