question on down pipe

[AN89HATCH]

so I spend 5 hours on friday trying to figure out a way to make a down pipe on my car with out it hitting the steering, or the transmission, and after 5 hours i finally found a way. Now my problem is I had to go get it welded at a muffler shop, and for some reason those muffler shop guys never seem to listen. It was a simple as connect the 2 lines, and weld. He tells me to come back in the afternoon. So i go back and what do i see? of course he manages to mess up something as simple as connecting the dots on the pipes, and weldinng the pipes togeather. He basically did some pipe extention thing, so now my piping will not fit at all (question)to make it fit i had to use a pretty big hammer, and hammer the pipe down quite abit so it would stop hitting the transmission. my down pipe is 2.5 and the hammer mark probolly makes the pipe 1.75 but i had to do it to make it clear. so my down pipe goes 2.5 down to 1.75 then back to 2.5, will this be ok for temporary? I just need to tune my car then i will take it to a mufffler shop, have them cut the pipe off and re weld a new pipe. will this back presure be bad for the motor?

[Structure240sx]

it will definitly be fine as a temp downpipe. unless you are trying to make 300+rwhp and lots of boost it will be fine for now

[fiznat]

Yeah it will "work." I would have it fixed before you do your tuning though. Why would you want to do your dyno pulls using a restrictive exhaust? Just fix it first, then take it to the rollers...