Exhaust System/De cat

Hi

I had a rattle from my exhaust system today, took it to the garage and they noticed the hole where the exhaust system goes into the manifold is bigger than the exhaust suggesting they person before me used an upgraded exhaust system, if that makes sense??? I'm not very clued up on it to be honest but I've been told I'd be better off upgrading my exhaust system, maybe to a down pipe or a de cat stainless steel sport one? I don't need to worry about doing the manifold or buying a new back box so just the exhaust system itself. 

Can I have some recommendations preferably with links please as to what you would recommend I get for my 02 plate Celica VVTLI 190bhp please?? As I don't really know what I am doing I'm not going to lie. 

Kind Regards 

1 hour ago, DANNY1210 said:

I had a rattle from my exhaust system today...

That seems to be a fairly common problem with the Gen' 7. The heat shields can rust badly around the fixing bolts which then allows them to rattle. Usually, removing the nut and placing a penny washer under it cures the problem.

I've been told it's not the heat shield though when he put it up, he said it's because the hole the exhaust system going into the manifold is in is bigger due to an upgraded exhaust system being fitted at some point??

Could it be that the narrower pipe from a 140 has been fitted as a cheaper replacement than the slightly wider 190 pipe?.