Should I support his dream car?

Hubby had an appointment to test drive a car at the Subaru’s showroom at around 1130am and would be back in time to send us to Jan’s place.
He had mentioned that he’ll be test driving the Legacy but I had a feeling that he’ll be also test driving his dream car WRX, and which he DID!!! After all these, he went to Jan’s place around 3 plus to meet us.
During dinner, we had a brief discussion about this issue. I’m pretty sure that Rex is the car he wanted very badly. It’ll cost us around $800 plus per month of the installment which is cheaper than the present $991. But the only disadvantage is that the yearly insurance is slightly higher than now, but the road tax will be the same.
I’ve told him that if he really wants the Rex, he will have to cut down on any modifications and I also took the opportunity to tell him that I’m not keen to have another baby. But he just shh me off. Hai… what makes him think that we can have another one? I’m very sure that he wants that car very much. His eyes sparkle when we talked about the Rex and of cos he kept telling me he’s still considering to have ‘Power’ or ‘Comfort’. But I’m very sure that he would prefer ‘Power’ so had been telling him no need to think so hard liao, just go and make a decision. I’m very sure that he will not fall in love with any other car. I even told him, his love for the Rex and the same as my love for my dear AL, it’s comparable!
Should I leave this to him? I’m quite sure that he already had made up his mind at the fist place. And test driving another car will be just to prove that the Rex is still better. How? Hmm...