I live in london ontarion and I'm trying to put together a ported non-turbo engine in an 88 rx7. I need it to pass emission because of our retarted laws and I am wondering what is the difference between the two non-turbo cats listed on rotary performance. One has two HF cats and the other has a presilencer and a HF cat. Will they both get me buy or should I go with the dual cat just to be safe?

 

what about 1 single bonez superflow cat,
it replaces the 2 cats with 1 big one, i did that with mine, it also sounds really good

 

if you say you are "putting the car together"..you should find out IF the car Becomes Exempt at 20 years of age(phone the Motor vehicle branch near you).and If so,Would you be able to Wait Until the New year to register and Plate the car,so it never Needs an E-Test again...If not .HI-Flo Bonez Cat!

 

87's are the last year to qualify for an exemption. Under current legislation, 88 and newer will always have to be 'sniffed'....in Ontario.