We used to do this for the FWD DSMs a long time ago because of how much cheaper it was to dump it out the side than a full exhaust. FWD DSMs if you remember have a solid rear axle so you have to go up and over the axle. We did learn one thing though, you want to tips to face rearwards a little. This helps with the scavenging effect AND when the exhaust was going straight out, you get get some hellacious whistling and noises from the tips. Think blowing over the top of a beer bottle.
Wiz