Back pressure... i guees thats the right way to say it haha

Yep you will lose back pressure but since you keep the stock y-pipe, you shouldn't lose any more back pressure than you would with a true dual.

SOLD!!
Thanks for looking.

ive done a serious exhaust switcharu im talking aam 3'' true dual then the nismo then a topspeed and i hate to say it but the 2.5'' is best for N/A engines because N/A doesnt compensate enough back pressure to produce for 3'' as to where a turbo engine does. why do you think turbo needs 3'' pipping minumum and theres people out there with 4''+ customer exhausts just to produce back pressure and keep there torque bands