I recently bought an Apexi WS catback exhaust for my Camry. I did it to accomodate the S/C with only 4psi. But the car actually requires more effort to accelerate now. And so I was about to put my stock one back on to get that quick acceleration back, but people told me to get an SAFC or something and then get it dyno tuned. Has anyone here experienced what i have or gotten an SAFC. If so did it make a difference? Is it worth it? What should I do, if you don't think that is neccessary for only 4psi. I always thought the exhaust would help make it accelerate faster, but it's a bit sluggish, I guess I might help top end though, but I want that low end acceleration back too. I would appreciate any bit of knowledge that you could provide or any experiences that you could share. Thanks a lot guys.