Go look at any 1990-1997 Chevy or GMC truck. The exhaust with will be a 2.5" single exhaust going through a 3 foot long muffler. Virtually every 5.7 liter chevy engine in a car is exactly that way. No issues with backpressure.
Call Larry Mann at FAE, he has specific numbers on pressures, and any losses of engine power for several models.
The FAE did not spin a bearing or destroy a rod. Bad luck from the factory, too little oil, no oil change, or something else did that.
1997 PS 205