Chris uses pie cuts on the Ti exhausts. Bending Ti tubing requires very specialized and very expensive equipment normally only used in the aerospace industry. As such, pie cutting is the only option on the Ti stuff. Mandrel bending can be used on SS and Inconel but not Ti.

My SS shown below weighs right at 35 lbs. It's not super light because the large HJS race cats are 10lbs for the pair and I also have the secondary flow through mufflers which add weight. With bypass pipes, the exhaust weighs about 28-29lbs. We are deleting the secondary mufflers on the Inconel version which will cut weight further. They are just not necessary for track use. I will also have bypass resonators which I may use during track season.

The reason I use cats is that I still register the car and very occasionally drive it on the street. I don't really care to cheat the system and polute. As such I choose to run the best and most efficient freest flowing cats available which allow the car to pass emissions. Even Cup cars come with 100 cell race cats from the factory. The 5.2" diameter 100 cell HJS Motorsport cats have a huge amount of cross sectional area with virtually zero restriction over bypass pipes. The only downside is their cost as they retail for about $900 each. Compare the size of these cats to the much smaller diameter cats normally used on budget exhausts. While they may still be 100 cell, the smaller "budget" cats will be much more restrictive due to the reduced cross section area and they will loose their efficiency much faster eventually resulting in check engine lights. The cat cone mounting flanges that Chris used on this exhaust also match up perfectly with the Turbo housings and there is no neck down that you normally have with a 3" bypass pipe for example. All small stuff that makes a difference..

[url=https://flic.kr/p/qU7Mup]

[url=https://flic.kr/p/rNBYuy]

[url=https://flic.kr/p/rysAyz]

 

I bet! SS or INCO is the way to go in my books, Ti is obviously crazy light but never seems to hold up for exhausts (a good true Motorsport system, not street/track)

Thanks John,
I didn't realise initially he was only pie-cutting the Ti systems; looked back on his IG account and was more astute...lol
Weight isn't bad at all considering it has heimholtz pipes and mufflers, and agree you don't need muffling at all for fun street drives or track use. INCO is exhaust-**** and glad you are going that way vs Ti.
My question on the catalysts was due solely to the track-use nature of your car/usage Those are nice cats, think the are the same as my old Milltek had...old Milltek full system flowed as well as my 'restrictive' 200cell straight pipes
I need to do an exhaust the deafening drone is getting old when cruising, lol
Cheers,
Rob