performance muffler or glasspack?

[bigCountry]

hey i did hav a xlerator high performance muffler on my car and when from a stop if i punched the gas my firebird would pill out a good 30feet but i just put on a glasspack it sounds good but when i stomp on the gas from a stop my car doesnt seem to pill out as much or accelerate as quickly from a stop but around 50mph when i stomp on the gas the car seems to really accelerate quicker y is that and would it be better to put the high performace muffler back on or what i dont know much about mufflers

[loser]

this should be in intake/exhuast.but i think its because glasspacks flow alot more, so your power moves up the RPM range.

[bigCountry]

i tested my 0-60 on my 3.8l firebird its 6.7sec is that good for a v6firebird and anyone know what kinda chip i should buy that will raise my horse power and torque and should i keep the glasspack or put the high performance muffler back on or go with a 40series flowmaster i noticed today driving that my car doesnt jump off the line with the glasspack like the muffler did but it accererates like a beast some one give me some tips

[BiH]

how did you test it?

[bigCountry]

stopwatch

[Paul Ford]

I highly doubt your car ran 0 to 60 in 6.7 with just a muffler. Stock is around mid to low 7's. If I were you I would buy a cat back instead of having three mufflers just sitting around. Just my two cents though.