Welcome to the forums!

So the single intake is no where near as good as the dual intake. This has been proven many times on the forums. I'm sure older members will chime in.

If you think 800 is too steep, there are a few more options. You can purchase a Sl55/E55 intake off ebay for about 225 shipped. This will be a direct bolt on and will look factory. You can throw in some KN&N filters and devil horns on the front to get maximize gains. This is probably the cheapest route with pretty good gains. A forum member once posted dyno results showing 25rwhp (The number might be off, I'm going off memory here). with the sl55 intake.

Your other option is to build your intake. Not too difficult and failry cheap as well. Most DIY intakes run about 300 and they will produce slightly better results compared to the sl55 intake. There is a site with DIY info: srt-6.com.

Good luck and enjoy the car.