Originally Posted by Eturner
+11. Not to mention that the "loss" in power is down low in that case!.. But would still see gains in the mid range and high end too!..
You would actually only see gains by going from say, a 3" pipe to a 4" pipe if you were restricted by the 3" pipe.
The ideal pipe diameter is the smallest size that keeps you at or near zero back pressure. Any bigger and you're giving up the low end with little to no gains up top.
That being said, to answer the OP, straight pipes will not hurt the car (as long as you still have headers with a proper O2 sensor setup). You might lose a small amount of power if you remove the x or h pipe because those actually help quite a lot with scavenging and velocity. The best bet would be to dump right after the mid pipe. These cars sound like a very obnoxious wet fart with straight pipes though... nothing like the old school v8s