Well with my 1JZ it breaths a lot better and is nice a quiet at idle so nobody pulls up next to me and expects the spankin they get from me. It is all in the beaterism of it. My cars paint aint the best and there are some dents but why fix em when you got a C5 vette pulled up next to you and you smoke him and he looks at you with this bewildered look of aww you know your good. Oh back to your question, If you have a turbo then you will notice a bit of gain from the test pipe but not really much get a 3" downpipe you will notice more there. Or you could get rid of the 7M all together and notice even more.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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