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E30 best value performances options (after 23HP increase)?

I bought my BMW 325 just last November and have been enjoying it immensely as an everyday driver.  I’m a student and don’t have too much money to throw at it, but I have increased the performance with a chip (off ebay), K&N filter and Signature Motoring heat shield.  All in all this stuff was less than $200.00 and gave me a whopping 23 HP/19ft/lb torque increase on the dyno.  (The Signature Motoring performance intake was actually in first and gave 8.3HP increase and the chip did the rest; except the chip w/stock intake only have +11 HP instead of the 18-20 advertised).  Either way I’m happy and the car feels a lot lighter and responsive.  

My next step is a performance exhaust.  I’ve got maybe $450 to spend.  Can I get something decent for this?  Does anyone have tried/true brand recommendation?  If anyone has something for sale, I'm interested.  I would need something street legal and bolt on that doesn’t require any custom welding jobs.  Thanks!  

Wait, you bought one of those ebay chips and you actually made power from it? Lol WOW. And your K&N filter with heatshield made 8hp? And these are actual dynos numbers where you have proof? Don't mean to sound like an ass, but that's pretty optimistic.