Open Exhaust on a 617?

[Skippy]

After doing some other work on my 300D last night, I decided to take the back portion of the exhaust system off to see how it would sound without. Short version: I like. Longer version: I mostly like it except for a bit of very low frequency booming that I get intermittently. I think this is in part due to the fact that my exhaust now terminates under the car approximately under the front passenger seat. Other than that it sounds AWESOME. You can definitely hear what the turbo is doing, and the sound is very pleasant and not too loud. Idle and cruise are only slightly louder than stock.

I'm thinking of getting some straight pipe added to carry the exhaust to the original termination point, but it will probably be a few weeks before I get around to doing that. I'm wondering if there's going to be a problem with having the exhaust like it is during that time. I used to have a '76 Buick with a 350 2bbl that had the exhaust set up the same way and I didn't have any problems with it, but that was a gasser and I think there was a bit more clearance between the exhaust exit and the bottom of the car in that case. Does anyone have experience with this setup in a turbo 617?

Mods: If this goes in Performance Tuning feel free to move.