i have a custom made exhaust on my ecotec and i have a glasspack
i have a video if your interested to hear it

Why? Its not like its illegal to not have a res.

Sure. What size pipe and what kind of muf and cat?

Its not illegal, correct. But it will be really loud and extremely annoying. Not to mention sound real rice

But I want loud. What if I replaced with glasspack?

i did 2.5 inch catback with no rez outta dynomax. driving up hills blows now... low end torque is gone. u can throw in a glasspack as a resonator if u want something a little more free flowing and it will compliment the dynomax muffler with a nice deep tone and no rasp. but once u take off the res it gets real raspy

Where's the o2 sensors located?

rk sport header factory cat, 2 1/2 pipe, glasspack muffler and it dumps right behind the drivers side rocker molding just turn up the volume for the video

gets really raspy up there in the high RPM's but its a 4-banger so what else can you say :p

i dont think any type of muffler will help a 4 banger, mine is real loud and real raspy

You should send me a pm with a vid, im interested to hear it personally

I don't think its the muffler that makes it raspy cause I replaced mine and it sounds low and no rasp. Its low pitched -4500 but then gets quite when in 4500+rpms. Now if I take off my res, I'm sure it will get raspy. So its not the muffler that causes the rasp

That's what the resonator is there for, is eliminate the drone of a v6 or v8, and the rasping of a 4 cyl