Things you'll need before you get started 1a welder perferably a mig 2 a sawzall or jigsaw wichever you like to call it 3 a welding table 4 Cardboard ( to make a template) 5 Sharpie or some kind of marker to mark so you can make your cuts. 6 header bolts ( found at the local auto store) 7 Header plates( which you can make yourself or you can have the weld shop make them for you since you will need about 1/4inch plate to make the plates) 8 most importan 8 prebent pipes ( found at your local exhuast shop have them bent to a 45deg. angle, as far as size for the pipes i went with 2 1/2 inch)
Things you should know before getting your pipe messure how tall you want your exhust to be at the bend. (If you can get prebent pipe elswhere feel free to do so im just giving the basic advice as simple as possiable)
So asuming you have your header plate go ahead and bolt it to your car exhaust ports, take your card board and make a trace of 1 of your exhaust pipes and trim your template to fit into your engine bay. Now depending on what type of engie your working with and how you want your exhaust to go you may need to make some adjustments as seen in the video below. Once you have your template made go ahead and lay it on your exhaust pipe take your maker and draw your line, then go ahead and take your sawzall and cut your pipe, check to be sure your pipe fits before cutting your next pipe.Once the first pipe checks out cut the next 3 ( the other side of the motor may be a lil diff so you will have to check to be sure you template fits the way you want it to)
So now you have your pipes all cut the next part may require a few extra hands and eyes. 1st person will tack your pipe 2nd person will stedy the pipe in the right location , and the 3rd person will watch from a far to see if the elignment of your pipe is straight or in the direction you want it in. (note to self the extra people just make it easier you can do with out!!!)
So all thats left once you've tacked all your pipes unbolt your header and finish your welds on your welding table.
Lastly bolt your headers on after cooling(you can put a cassgate on or not ) Fire up the car and enjoy your handy work!!!!
Check it out: https://youtu.be/QyGMFK0qvm4
