anyone used a mark two decat pipe before

[Carlvtr88]

for 25 quid i Can get a custom decat pipe. Mainly i need it for my blowing standard cat Downpipe. But yeah, the one i have been offered is basically half a standard Downpipe and its been cut where the cat would normally be, then a stainless steel replacement bit is welded on. Would you recommend this as a temp solution until i get a proper manifold ? And also is there anything i Can put on the standard part of it to stop it rusting like my current one has.